Updated openstack/openstack
Project: openstack/python-troveclient  b42ebc9c481201db72d023e7d406c6bd3cc91204
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Use Resource() class from common Oslo code

In the process of unification of the clients code we should
reuse common functionality from Oslo. Resource() class from trove
duplicates Oslo funclionality, so we replace it with inheritance

Related to blueprint common-client-library-2

Change-Id: I9809bd3036a5b544b8ff011432f64dc5af793f61