docs: Add placement-client to compute's ENABLED_SERVICES

In a multinode setup, the compute node needs to report to the
placement service. If it does not do so, it effectively does not exist
from the scheduler's point of view. This patch adds placement-client
to the compute node's ENABLED_SERVICES so that this can happen.

Change-Id: Ibfcd84e4626301bcdea70f719ade7f8365d03497
1 file changed