Skip stateless SG dualstack tests when openvswitch fw driver is used

Openvswitch firewall driver does not support stateless SG so tests from
classes:
StatelessSecGroupDualStackDHCPv6StatelessTest
StatelessSecGroupDualStackSlaacTest

from the module neutron_tempest_plugin.scenario.test_security_groups
should be skipped in such case.

Closes-bz: https://bugzilla.redhat.com/show_bug.cgi?id=2227138
Change-Id: Ice0f3573dd51851752c745c0b1d35c82bd7808fd
1 file changed