nova-placement has been removed as of train, since we
do not support openstack releases before train, it
is no longer needed. This change removes nova-placement
from the nova chart and all the overrides, as well as
changes the compute-kit scripts to always deploy
the placement chart.
Change-Id: Ic8649371fe9e954806cbe4bf11c589fb58c7a88d
d1b72aa35e