1. Fix bug that relative path need normalize when load snapshot
2. Use zip decompresser since decompress tar file may lead dead loop
3. Move raft.endpoint and raft.group_peers into rest-server.properties
4. Pass raft.endpoint and raft.group_peers from server to core
5. Let RestServer start before GremlinServer
6. Use read-index to ensure the raft log caught up for new node
7. Let add_peer and remove_peer API work in async job
8. Let truncateBackend don't truncate system store

Change-Id: I7de3d98cb51c3b7c32a4f19a0d99ed622f78d331

Change-Id: Iba6e9cbfab15f28cab4126b7ef8ab7210370a0d6

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