Use Tempest-lib's compute security_group_rules_client

Compute security_group_rules_client has been migrated to
tempest-lib- I2be5d9983dd31a2af455fdb5c495227f22b3f575

Now Tempest-lib provides this client as stable interface so Tempest
should start using this from lib and remove its own copy.
Also remove its unit tests.

This commits makes Tempest to use compute security_group_rules_client
from Tempest-lib.

NOTE- There are difference between migrated files and current tempest file
for H404, H405 fix - I3abac40ebb33836980c119d59bc97f035b213c0a
But those are already taken care in lib.

Change-Id: Ibeef0417ab40504da113731dc7c4e7005401b714
6 files changed