* The nova-placement-api package creates a "nova-placement-api.conf" in
apache2 sites-available, which currently leads to two conflicting
configurations (our "placement-api.conf" and the one from the package
"nova-placement-api.conf"). With this change the
"nova-placement-api.conf" will be replaced with our version of it.
Change-Id: I8ee7f190a6d73cace60a5fcd6b58d6b4e0288a95