Add local ip scenario tests

With Local IP static_nat set to True (for work with ovs firewall) - back
ICMP traffic from VM with Local IP assigned will have source IP
substituted with local IP. To overcome this new parameter was added to
check_remote_connectivity - check_responce_ip

Depends-On: https://review.opendev.org/c/openstack/neutron/+/818228
Depends-On: https://review.opendev.org/c/openstack/neutron/+/824363
Change-Id: I85b4c07a623443e3fd856b9218024773125f20eb
3 files changed