Increase priority of routes by LINK_LOCAL_PEER.

Fixes bug where path added by ARP is of higher priority than link-local path.
This was resulting in failing of metadata access to/from VM

Change-Id: I99af613fe02ad55aab5f0921cb67fc44d77fee87
Partial-Bug: #1364308
Merge "Increase priority of routes by LINK_LOCAL_PEER."