Fix api_extensions_path in neutron-opencontrail environment
Fix api_extensions_path in neutron-opencontrail environment

There is a missing repositiry for LBaaS in api_extensions_path in neutron-opencontrail.
This patch is working in my lab : tripleo liberty and opencontrail 3.0.2

Closes-Bug: #1634120

Change-Id: Ie06612faf226d0e5e75f3f8a9b560118cba5ff4c
Signed-off-by: Cyril Lopez <ffe1bb89006ff00f864de2760363f0db3e09abed@redhat.com>

dprince/tripleo-heat-templates,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates