Set explicit route for VIPs

When VIPs are moved around explicit route for each VIP is
set to make sure that connections opened from local node to VIP
don't use VIP as source address - if VIP is used as source address
and is moved away then connections are stalled.

This explicit routes are removed when VIPs are moved to another node.

Closes-Bug: 1376200
Change-Id: Ie5d55fbe33231519015b313b1f9210ac3614266e
Merge "Set explicit route for VIPs"