Fix the end point test for client
Fix the end point test for client

Due to recent change in neutronclient the endpoint value got changes
in following patch.

https://review.openstack.org/#/c/236325/

This patch will test both public or publicURL endpoints.

Change-Id: I0dffb06c5151203e9fe2ab041a7beb028a39aac0
Closes-bug: #1517579

eayunstack/neutron,bigswitch/neutron,openstack/neutron,igor-toga/local-snat,MaximNevrov/neutron,sebrandon1/neutron,noironetworks/neutron,igor-toga/local-snat,dims/neutron,apporc/neutron,MaximNevrov/neutron,mahak/neutron,mahak/neutron,huntxu/neutron,wolverineav/neutron,cloudbase/neutron,sebrandon1/neutron,wolverineav/neutron,noironetworks/neutron,openstack/neutron,apporc/neutron,klmitch/neutron,eayunstack/neutron,mahak/neutron,bigswitch/neutron,openstack/neutron,huntxu/neutron,cloudbase/neutron,klmitch/neutron,dims/neutron