Drop generation of upstart override file and /etc/environment and
scrub any existing charm configuration in these locations from
an existing install.
These where required way back in the dawn of time when ceph support
was alpha/beta in cinder.
Provide backend specific configuration file path, allowing multiple
ceph clusters to be used with a single cinder application.
Change-Id: I7adba0d35fb7406afa40f047b79a9ab51a6a333d
Closes-Bug: 1769196
3451c1c498