Fix Ceilometer metadata
Fix Ceilometer metadata

The previous version of this file stored the full JSON output
of a request for a configuration variable instead of just just
the actual response. This is harder to parse and generally a
bad idea.

This commit corrects that oversight.

Change-Id: I2b935b91beaaf87a1033098fe489c00892d00094

jkilpatr/browbeat,jkilpatr/browbeat