Updated openstack/openstack
Project: openstack/trove  2ce422733d4123c457b2dd8a37dc5bbefda52753
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Moving storage logic out of backup runner class

* Adding a StreamReader to handle segment logic
* Refactored base classes to make subclasses easier

Closes-Bug: #1251649

Change-Id: Ic22bb42827e0f5dc593df8705737fe27c1feabb8