tree 1ca487c8408c0b6a9b513b1a251a25689f5fbbf0
parent a6478982753e73526abffa6573748e27a63fc494
author Chris Dent <chdent@redhat.com> 1413317312 +0100
committer Chris Dent <chdent@redhat.com> 1413317312 +0100

Use $() instead of ``

There are other instances of this in other files, just tidying
ceilometer at the moment.

Change-Id: I136a20d7ac50fdf02cbd1102613e324e313b7b0a