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>
(cherry-picked from 2cd90e8f36ce07d40763fb3b92292194f9d9c173)
trozet/opnfv-tht,trozet/opnfv-tht,trozet/opnfv-tht