Find instance rootPath is painful, this PR add auto flag to find milvus rootPath in etcd.
If there is only one candidate, connect command will use it automatically
Needs approval from an approver in each of these files:
- ~~[OWNERS](https://github.com/milvus-io/birdwatcher/blob/v1.0.x/OWNERS)~~ [congqixia]
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Find instance rootPath is painful, this PR add auto flag to find milvus rootPath in etcd. If there is only one candidate, connect command will use it automatically