Add some tests for security_group_rules api

- test_security_group_rules_delete_when_peer_group_deleted
- test_create_security_group_rule_with_invalid_id
- test_create_security_group_rule_duplicate

Change-Id: Ia07944079e7ffb250bf6ad9d0598592660a49a6f
Merge "Add some tests for security_group_rules api"