fbf4899764
The cinder.db.sqlalchemy.api.volume_glance_metadata_bulk_create function
has the following in its docstring:
This API does not support changing the value of a key once it has
been created.
However, it actually fails if a specified key exists and has the same
value. This can cause problems if volume creation is retried following a
failure, since the metadata may have already been created.
This change modifies the function to ignore keys that exist and have the
expected value, as per the docstring.
Related-Bug: #1823445
Change-Id: Ibc3f7b995c43bc281b6978bfcba4d1a50db41fa3
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