Add tripleo-ci-centos-7-ovb-ha-ipv6 into tripleo-ci jobs
Add tripleo-ci-centos-7-ovb-ha-ipv6 into tripleo-ci jobs

Add tripleo-ci-centos-7-ovb-ha-ipv6 job into openstack-infra/tripleo-ci
jobs list in experimental pipeline. It was missing because it was set in
another layout, overriden by tripleo-ci layout.

Change-Id: I07afdec38d80431c3da6ce51d79fa449bb838649

Tesora/tesora-project-config,Tesora/tesora-project-config,openstack-infra/project-config,openstack-infra/project-config