Create /var/log/placement on host for file logging
Create /var/log/placement on host for file logging

/var/log/placement is missing in the list of directories to be
created.

Change-Id: I6215e8a36877bb922c083863d4cba029974f1cf7
Closes-Bug: 1826189

openstack/tripleo-heat-templates,openstack/tripleo-heat-templates