Updated openstack/openstack
Project: openstack/nova  8c884fd74979b873acd510842e9303e271e634cb

initialize objects with context in resource tracker

These changes aim to clean up the pattern of passing a context in
object member functions create/destroy/refresh/save and instead
initialize the object with the context when it's constructed.

Related to blueprint kilo-objects

Change-Id: I47c25c144d1f970781d6288073041501966f0178