The placement service is required, nova cannot start without it,
so we must always configure the authtoken even if the flag to deploy
the integrated nova-placement-api is disabled. This will enable the
ability to move placement into a separate service, disable the
nova-placement-api deployment, yet still configure the required
authtoken in nova.conf.
Depends-On: I58788af6f02a4b339a270dff69a86ce7cdea41d3
Change-Id: I4619d333187a0e96c1b60fe2f203df0838c12059
fd6da36ab5