I have killed vrrp process on Active agent host the router and HA occurs, vrrp process are respawn openstack-neutron-2015.1.2-7.el7ost.noarch
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHBA-2016-0260.html