Tie pub vip with public gw ping

Add new pacemaker cloned "ping" primitive and tie it with public
vip via "location" in order to migrate public VIP in case
controller can't ping public gateway.

Closes-bug: 1370510
Change-Id: Ibf4fedee536ac9eb106206060b58a6039558ef85
Merge "Tie pub vip with public gw ping"