Make glance image checking a little less dependent on the rest of the smoketest.
Merge pull request #87 from VictorLowther/pull-req-release-pebbles-master-242742b4b067a7627f01458f3367e810cecd83dd

https://github.com/crowbar/barclamp-glance/pull/87

Merged by devtool for VictorLowther