Updated openstack/openstack
Project: openstack/oslo-incubator  9620a3ee10e671853be93950a8b913d49f1bc845

ServiceRestartTest: make it more resilient

The test spawned new processes to run services in, but didn't guard test
suite with due attention not to leak those processes into test
environment.

Proper guarding mechanism is already implemented for another test,
ServiceLauncherTest. Hence it was moved to their common ancestor
(ServiceTestBase) and reused in both test classes.

Closes-Bug: #1382573
Change-Id: If4ee7ed09696c3f5f3273f4d280c567b328ca75c