Fix pep8 for ostf_adapter

PEP8 fix has been added for ostf_adapter scripts. Fix is incomplete
(especially for E501 "Line is too long") because of meaningless of such
fixing.

Fix unit tests

Several unit tests have been fixed in order to support new discovery
behaviour - new deployment tag which is indicates network manager for
deployment (nova-network or quantum).

Change-Id: Id7b39477e33719695bfcc99173825d75b304c5b3
Merge "Fix pep8 for ostf_adapter"