Allow rulesets modification in secgroups

As part of tempest-scenario-manager-cleanup[1] effort it would be good
to allow plugins to define their own security group rulesets
as they're not always the same as tempest's (f.e. manila tempest plugin[2])

[1]https://etherpad.opendev.org/p/tempest-scenario-manager-cleanup
[2]https://opendev.org/openstack/manila-tempest-plugin/src/branch/master/manila_tempest_tests/tests/scenario/manager.py#L1001

Change-Id: I3cb3a6f67ea507d9e721a31fcba78f8344c630ca
1 file changed