devstack: fix debug info for Gnocchi

Currently the gate job fails with:

2015-10-12 12:05:42.435 | * Unprocessed measures:
2015-10-12 12:05:42.448 | find: `/measures': No such file or directory

Because we didn't source the Gnocchi settings.

Change-Id: I35f2ea0d23a38d1cb514db72c2fe4bdf41c06f29
1 file changed
tree: 4637e69a03f6890264a9171cbeb50b31c4a26093
  1. ceilometer/