Make Server metadata a passive store again

This change reverts the software deployments change which polls
the deployments API whenever a Server resource metadata is read.

The Server metadata has reverted to being a standard resource
metadata store, and the deployments are pushed into this metadata
directly in the database whenever the deployments API is used to
create or update a deployment.

As part of the effort to not require a Stack.load for polling metadata
this change is for
Partial-Bug: #1306743

Change-Id: Ib461e1bab816d4b9e332786004c53a2f73d773e8
TestRandomString was calling the wrong setUp

Just incorrect usage of super(). This was bypassing HeatTestCase.setUp()
and causing extra logs to be printed.

Change-Id: I6f77cce53b971b14637e8705c3f73993ac458550
Partial-bug: 1281226
Merge "Make Server metadata a passive store again"
Merge "TestRandomString was calling the wrong setUp"