Use flake8 to replace pep8 because pep8 is invalid from the log.
enable pep8/flake8 voting and suppress flake8 Errors(fix later)
Story: 2003429
Task: 24623
Change-Id: I79e9def77dc0c8ce74403d4ba846b35ae5aa487b
Signed-off-by: chenyan <yan.chen@intel.com>
Signed-off-by: Sun Austin <austin.sun@intel.com>