Searchlight Style Commandments

Step 1: Read the OpenStack Style Commandments https://docs.openstack.org/hacking/latest
Step 2: Read on

Searchlight Specific Commandments

[SL316] Change assertTrue(isinstance(A, B)) by optimal assert like assertIsInstance(A, B)
[SL317] Change assertEqual(type(A), B) by optimal assert like assertIsInstance(A, B)
[SL318] Change assertEqual(A, None) or assertEqual(None, A) by optimal assert like assertIsNone(A)
[SL319] Validate that logs are not translated
[SL320] For python 3 compatibility, use six.text_type() instead of unicode()
[SL327] Prevent use of deprecated contextlib.nested
[SL343] Check for common double word typos