tree ee70a86f2b0f36c56bf0897858b10dc3e45ba1b6
parent 78b300c7c459a74ebcdc553e2bc315237bebe82c
author Jonathan Hart <jono@onlab.us> 1438377813 -0700
committer Gerrit Code Review <gerrit@onlab.us> 1439487535 +0000

ONOS-2513 Fix entire MP2SP intent failing on partial connectivity loss

 * Added PartialFailureContraint to MP2SP intent to allow partial connectivity.
   This means the intent remains installed as long as at least one ingress point
   can reach the egress point.
 * Intents with this constraint are recompiled on ObjectiveTracker triggers
   even if not in FAILED state
 * MP2SP intent compiler can compute a partial tree if constraint is set
 * ObjectiveTracker recompiles intents on any link event
 * SDN-IP MP2SP intents now use PartialFailureConstraint

Ported from onos-1.2 branch.

Change-Id: I32eaa198fae1dfba021d9251c8f855573f0e1d7d