Deleting multiple volume metadata keys with a single request
to improve performance. To delete multiple metadata items without
affecting the remaining ones, just update the metadata items with
the updated complete list of ones (without items to delete)
in the body of the request. This patch uses etags to avoid the
lost update problem with volume metadata. The command isn't changed:
$ cinder metadata volume_id unset k1 k2 k3
Co-Authored-By: Ivan Kolodyazhny <e0ne@e0ne.info>
Depends-On: I575635258c10f299181b8e4cdb51a7ad1f1be764
Implements: blueprint delete-multiple-metadata-keys
Change-Id: I8e18133ffee87c240a7af4b8177683ab99330d9e
e15d8e7f09