Updated graphite metric paths to match new server layout

Changed from a layout like:

 cells.<availability_zone>.total_instances
 cells.<availability_zone>.domains.<email_domain>.used_vcpus

To a layout like:

 az.<availability_zone>.total_instances
 az.<availability_zone>.domain.<email_domain>.used_vcpus

Change-Id: I7f40b590bc03a5fa42816ba919e667b00274c3da
Removed unused settings file

Change-Id: I530894631f240d5de7ba67d4a008353d48c7339b