Reorganize unit test locations under tests/unittests (#1126)

This attempts to standardize unit test file location under test/unittests/
such that any source file located at cloudinit/path/to/file.py may have a
corresponding unit test file at test/unittests/path/to/test_file.py.

Noteworthy Comments:
====================
Four different duplicate test files existed:
test_{gpg,util,cc_mounts,cc_resolv_conf}.py
Each of these duplicate file pairs has been merged together. This is a
break in git history for these files.

The test suite appears to have a dependency on test order. Changing test
order causes some tests to fail. This should be rectified, but for now
some tests have been modified in
tests/unittests/config/test_set_passwords.py.

A helper class name starts with "Test" which causes pytest to try
executing it as a test case, which then throws warnings "due to Class
having __init__()".  Silence by changing the name of the class.

# helpers.py is imported in many test files, import paths change
cloudinit/tests/helpers.py -> tests/unittests/helpers.py

# Move directories:
cloudinit/distros/tests -> tests/unittests/distros
cloudinit/cmd/devel/tests -> tests/unittests/cmd/devel
cloudinit/cmd/tests -> tests/unittests/cmd/
cloudinit/sources/helpers/tests -> tests/unittests/sources/helpers
cloudinit/sources/tests -> tests/unittests/sources
cloudinit/net/tests -> tests/unittests/net
cloudinit/config/tests -> tests/unittests/config
cloudinit/analyze/tests/ -> tests/unittests/analyze/

# Standardize tests already in tests/unittests/
test_datasource -> sources
test_distros -> distros
test_vmware -> sources/vmware
test_handler -> config        # this contains cloudconfig module tests
test_runs -> runs

1 files changed, 21 insertions, 0 deletions

diff --git a/tests/unittests/distros/__init__.py b/tests/unittests/distros/__init__.py
new file mode 100644
index 00000000..5394aa56
--- /dev/null
+++ b/tests/unittests/distros/__init__.py
@@ -0,0 +1,21 @@
+# This file is part of cloud-init. See LICENSE file for license information.
+import copy
+
+from cloudinit import distros
+from cloudinit import helpers
+from cloudinit import settings
+
+
+def _get_distro(dtype, system_info=None):
+    """Return a Distro class of distro 'dtype'.
+
+    cfg is format of CFG_BUILTIN['system_info'].
+
+    example: _get_distro("debian")
+    """
+    if system_info is None:
+        system_info = copy.deepcopy(settings.CFG_BUILTIN['system_info'])
+    system_info['distro'] = dtype
+    paths = helpers.Paths(system_info['paths'])
+    distro_cls = distros.fetch(dtype)
+    return distro_cls(dtype, system_info, paths)