1.changes to cover security grp tests using both contrail and openstack APIs. 2.added TC description, steps and pass criteria. 3.new test case addition. 4.added sg verification in agent in vm fixture

Change-Id: I36289082a14036ee812719a0aa9c9131778cd1e9
Merge "1.changes to cover security grp tests using both contrail and openstack APIs. 2.added TC description, steps and pass criteria. 3.new test case addition. 4.added sg verification in agent in vm fixture" into R2.0