Updated openstack/openstack
Project: openstack/python-heatclient  89282eb2eb7686217ffd29c991631c462f077447
null
Replace inheritance hierarchy with composition

In the process of unification of the clients code we should use
composition to allow easier replacement with common HTTPClient.

Related to blueprint common-client-library-2

Change-Id: I1e4ec379e1f6289ed26a5a3157917d3d20a36bd6