support authentication for zookeeper/etcd #1330
Merged
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this PR add support for authentication of zookeeper/etcd.
when coordinator=filesystem, authentication is skipped.
when coordinator=zookeeper, the client will addauth after connected, and replace the worldACL with the corresponding digestACL.
when coordinator=etcd, the client will authenticate with the specified username/password, permissions should be granted manually with etcdctl.
but i'm not familiar with etcd, thus the etcd part is not well-tested.
please review it.
thanks very much.