Bug-1830:Move install snapshot messages from akka-raft to sal-commons

Change-Id: I0bc5e68879ce0b7026c8bfda94ad7e2038aedff8
Signed-off-by: Kamal Rameshan <kramesha@cisco.com>
Merge "Bug-1830:Move install snapshot messages from akka-raft to sal-commons"