fix bug in unittest for docker command
fix bug in unittest for docker command

simple fix, one of the docker commands wasn't
being run with sudo which was causing issues on
some systems.  this addresses it.

Change-Id: I9bff438a7c311c931d3971bcf0400ae023099cbb

stackforge/solum,openstack/solum,ed-/solum,ed-/solum,stackforge/solum,devdattakulkarni/test-solum,ed-/solum,openstack/solum,ed-/solum,devdattakulkarni/test-solum