wangxiyuan f89614d2e2 [api-ref] Add snapshot metadata key api ...

The patch did:
1. Add the missing GET/DELETE/PUT api-ref for snapshot metadata key.
2. Fix snapshot_id description.

Change-Id: I817b1ccffd5e929bcf78b913d666073596b93612

2017-06-19 11:27:22 +08:00

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[api-ref] Add snapshot metadata key api

2017-06-19 11:27:22 +08:00