Update to pylint 2.2.2.

The tip-pylint tox target correctly reported the invalid use of
string formatting.  The change here is to:

a.) Fix the error that was caught.
b.) move to pylint 2.2.2 for the default 'pylint' target.

1 files changed, 1 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index 2fb3209d..d983348b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -21,7 +21,7 @@ setenv =
 basepython = python3
 deps =
     # requirements
-    pylint==1.8.1
+    pylint==2.2.2
     # test-requirements because unit tests are now present in cloudinit tree
     -r{toxinidir}/test-requirements.txt
 commands = {envpython} -m pylint {posargs:cloudinit tests tools}