Updated openstack/openstack
Project: openstack/trove  22b80bdb594086dfc6425d3cbfa83643601aed24
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Adding Incremental Backups

* Adding a config flag to register incremental runners
* Adding InnoBackupExIncremental runner and restore strategy.
* Adding save_metadata and load_metadata methods for
  swift storage strategy.
* Adding incremental backup/restore integration test.

Implements: blueprint incremental-backups

Change-Id: I1f0d4e5967097498f86a5052c33c55471e24a137