Take only the v4 address for service health check IP.
Take only the v4 address for service health check IP.

When we have dual interfaces, v4 and v6 service health check addresses are
created and sent to agent. Agent oper data has only one service health check
address, which is a problem. Updating to use only the v4 address. Need to add
support for v6 health check separately.

Change-Id: Ia5c1973c500d1e6d5d89ca83c3a48b8d94c0e579
closes-bug: #1692283

rombie/contrail-controller,eonpatapon/contrail-controller,nischalsheth/contrail-controller,eonpatapon/contrail-controller,eonpatapon/contrail-controller,nischalsheth/contrail-controller,eonpatapon/contrail-controller,nischalsheth/contrail-controller,eonpatapon/contrail-controller,nischalsheth/contrail-controller,nischalsheth/contrail-controller,rombie/contrail-controller,rombie/contrail-controller,rombie/contrail-controller,eonpatapon/contrail-controller,eonpatapon/contrail-controller,nischalsheth/contrail-controller,rombie/contrail-controller,nischalsheth/contrail-controller,rombie/contrail-controller,rombie/contrail-controller,nischalsheth/contrail-controller