Add liveinstnaceInfoProvider which allow application to store info in
LiveInstance ZNode
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-helix

Conflicts:
	helix-core/src/test/java/org/apache/helix/manager/zk/TestZkClusterManager.java
fix failing tests
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-helix