Skip load balancer API test for ipv6 network

Default loadbalancer backend is haproxy version 1.4
which doesn't support ipv6. That leads to check-grenade-dvsm-neutron
job failures.

Need to skip this test until noop driver is used in tempest
configuration/API test or until backend supports ipv6

Change-Id: Ida4559752df827393845b1a78e562d69694d06ed
Closes-Bug: #1402007
1 file changed