Fix E402 (module level import not at top of file) pep8 errors
and no longer ignore new failures.
Trivialfix
Change-Id: If9a202f1f322b5b03966c692e33e94b7c872079b
This patch includes db models and migration rules for initial
logging object. The implementation bases on logging api for
security group spec[1]
[1] https://goo.gl/t3NUlr
Partially-implements: blueprint security-group-logging
Related-Bug: #1468366
Change-Id: I3f91b3927c33021facc9eb9238555c0e06a918c0