Fix `make style-check` errors (#1000)

Using flake8 inplace of pyflakes
Renamed run-pyflakes -> run-flake8
Changed target name to flake8 in Makefile

With pyflakes we can't suppress warnings/errors in few required places.
flake8 is flexible in that regard. Hence using flake8 seems to be a
better choice here.

flake8 does the job of pep8 anyway.
So, removed pep8 target from Makefile along with tools/run-pep8 script.

Included setup.py in flake8 checks

11 files changed, 23 insertions, 40 deletions

diff --git a/Makefile b/Makefile
index 5fb0fcbf..0c015dae 100644
--- a/Makefile
+++ b/Makefile
@@ -18,13 +18,10 @@ all: check
 
 check: check_version test yaml
 
-style-check: pep8 $(pyflakes)
+style-check: flake8
 
-pep8:
-	@$(CWD)/tools/run-pep8
-
-pyflakes:
-	@$(CWD)/tools/run-pyflakes
+flake8:
+	@$(CWD)/tools/run-flake8
 
 unittest: clean_pyc
 	python3 -m pytest -v tests/unittests cloudinit
@@ -86,6 +83,6 @@ deb-src:
 doc:
 	tox -e doc
 
-.PHONY: test pyflakes clean pep8 rpm srpm deb deb-src yaml
+.PHONY: test flake8 clean rpm srpm deb deb-src yaml
 .PHONY: check_version pip-test-requirements pip-requirements clean_pyc
 .PHONY: unittest style-check doc
diff --git a/cloudinit/cmd/devel/hotplug_hook.py b/cloudinit/cmd/devel/hotplug_hook.py
index a0058f03..d4f0547e 100644
--- a/cloudinit/cmd/devel/hotplug_hook.py
+++ b/cloudinit/cmd/devel/hotplug_hook.py
@@ -13,7 +13,8 @@ from cloudinit.net import activators, read_sys_net_safe
 from cloudinit.net.network_state import parse_net_config_data
 from cloudinit.reporting import events
 from cloudinit.stages import Init
-from cloudinit.sources import DataSource, DataSourceNotFoundException
+from cloudinit.sources import DataSource  # noqa: F401
+from cloudinit.sources import DataSourceNotFoundException
 
 
 LOG = log.getLogger(__name__)
diff --git a/cloudinit/distros/__init__.py b/cloudinit/distros/__init__.py
index a634623a..2e629143 100755
--- a/cloudinit/distros/__init__.py
+++ b/cloudinit/distros/__init__.py
@@ -16,7 +16,7 @@ import stat
 import string
 import urllib.parse
 from io import StringIO
-from typing import Any, Mapping
+from typing import Any, Mapping  # noqa: F401
 
 from cloudinit import importer
 from cloudinit import log as logging
diff --git a/cloudinit/sources/__init__.py b/cloudinit/sources/__init__.py
index cc7e1c3c..54b8240a 100644
--- a/cloudinit/sources/__init__.py
+++ b/cloudinit/sources/__init__.py
@@ -13,7 +13,7 @@ import copy
 import json
 import os
 from collections import namedtuple
-from typing import Dict, List
+from typing import Dict, List  # noqa: F401
 
 from cloudinit import dmi
 from cloudinit import importer
diff --git a/cloudinit/stages.py b/cloudinit/stages.py
index bc164fa0..80aa9f5e 100644
--- a/cloudinit/stages.py
+++ b/cloudinit/stages.py
@@ -9,7 +9,7 @@ import os
 import pickle
 import sys
 from collections import namedtuple
-from typing import Dict, Set
+from typing import Dict, Set  # noqa: F401
 
 from cloudinit.settings import (
     FREQUENCIES, CLOUD_CONFIG, PER_INSTANCE, PER_ONCE, RUN_CLOUD_CONFIG)
diff --git a/setup.py b/setup.py
index 7fa03e63..100575ff 100755
--- a/setup.py
+++ b/setup.py
@@ -28,9 +28,11 @@ import subprocess
 RENDERED_TMPD_PREFIX = "RENDERED_TEMPD"
 VARIANT = None
 
+
 def is_f(p):
     return os.path.isfile(p)
 
+
 def is_generator(p):
     return '-generator' in p
 
@@ -111,6 +113,7 @@ def render_tmpl(template, mode=None):
     # return path relative to setup.py
     return os.path.join(os.path.basename(tmpd), bname)
 
+
 # User can set the variant for template rendering
 if '--distro' in sys.argv:
     idx = sys.argv.index('--distro')
@@ -166,7 +169,7 @@ elif os.path.isfile('/etc/system-release-cpe'):
     with open('/etc/system-release-cpe') as f:
         cpe_data = f.read().rstrip().split(':')
 
-        if cpe_data[1] == "\o":
+        if cpe_data[1] == "\o":  # noqa: W605
             # URI formated CPE
             inc = 0
         else:
@@ -216,7 +219,8 @@ class InitsysInstallData(install):
         if self.init_system and isinstance(self.init_system, str):
             self.init_system = self.init_system.split(",")
 
-        if len(self.init_system) == 0 and not platform.system().endswith('BSD'):
+        if (len(self.init_system) == 0 and
+                not platform.system().endswith('BSD')):
             self.init_system = ['systemd']
 
         bad = [f for f in self.init_system if f not in INITSYS_TYPES]
diff --git a/tests/integration_tests/clouds.py b/tests/integration_tests/clouds.py
index f2362b5d..32fdc91e 100644
--- a/tests/integration_tests/clouds.py
+++ b/tests/integration_tests/clouds.py
@@ -28,7 +28,7 @@ from tests.integration_tests.instances import (
 from tests.integration_tests.util import emit_dots_on_travis
 
 try:
-    from typing import Optional
+    from typing import Optional  # noqa: F401
 except ImportError:
     pass
 
diff --git a/tests/integration_tests/instances.py b/tests/integration_tests/instances.py
index 055ec758..63e0e630 100644
--- a/tests/integration_tests/instances.py
+++ b/tests/integration_tests/instances.py
@@ -13,7 +13,9 @@ from tests.integration_tests import integration_settings
 try:
     from typing import TYPE_CHECKING
     if TYPE_CHECKING:
-        from tests.integration_tests.clouds import IntegrationCloud
+        from tests.integration_tests.clouds import (  # noqa: F401
+            IntegrationCloud
+        )
 except ImportError:
     pass
 
diff --git a/tools/run-pyflakes b/tools/run-flake8
index 179afebe..0021cdb9 100755
--- a/tools/run-pyflakes
+++ b/tools/run-flake8
@@ -2,7 +2,7 @@
 
 CR="
 "
-pycheck_dirs=( "cloudinit/" "tests/" "tools/" )
+pycheck_dirs=( "cloudinit/" "tests/" "tools/"  "setup.py" )
 
 set -f
 if [ $# -eq 0 ]; then
@@ -11,7 +11,7 @@ else
    files=( "$@" )
 fi
 
-cmd=( "python3" -m "pyflakes" "${files[@]}" )
+cmd=( "python3" -m "flake8" "${files[@]}" )
 
 echo "Running: " "${cmd[@]}" 1>&2
 exec "${cmd[@]}"
diff --git a/tools/run-pep8 b/tools/run-pep8
deleted file mode 100755
index 4bd0bbfb..00000000
--- a/tools/run-pep8
+++ /dev/null
@@ -1,21 +0,0 @@
-#!/bin/bash
-
-pycheck_dirs=( "cloudinit/" "tests/" "tools/" )
-
-CR="
-"
-[ "$1" = "-v" ] && { verbose="$1"; shift; } || verbose=""
-
-set -f
-if [ $# -eq 0 ]; then unset IFS
-   IFS="$CR"
-   files=( "${bin_files[@]}" "${pycheck_dirs[@]}" )
-   unset IFS
-else
-   files=( "$@" )
-fi
-
-myname=${0##*/}
-cmd=( "${myname#run-}" $verbose "${files[@]}" )
-echo "Running: " "${cmd[@]}" 1>&2
-exec "${cmd[@]}"
diff --git a/tox.ini b/tox.ini
index 27c16ef3..aad286ff 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,7 +13,7 @@ passenv=
 basepython = python3
 deps =
     flake8==3.8.2
-commands = {envpython} -m flake8 {posargs:cloudinit/ tests/ tools/}
+commands = {envpython} -m flake8 {posargs:cloudinit/ tests/ tools/ setup.py}
 
 # https://github.com/gabrielfalcao/HTTPretty/issues/223
 setenv =
@@ -119,7 +119,7 @@ deps =
     pytest==3.0.7
 
 [testenv:tip-flake8]
-commands = {envpython} -m flake8 {posargs:cloudinit/ tests/ tools/}
+commands = {envpython} -m flake8 {posargs:cloudinit/ tests/ tools/ setup.py}
 deps = flake8
 
 [testenv:tip-pylint]