
Deleting multiple volume metadata keys with a single request to improve performance. This patch uses etags to avoid the lost update problem with volume metadata. To inject the response's `Etag` header the index method returns webob.Response object with this tag. APIImpact Related blueprint: delete-multiple-metadata-keys Change-Id: I575635258c10f299181b8e4cdb51a7ad1f1be764
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