Better start/stop handling for cells

This adds separate cells calls for start/stop compute API methods that
handles objects.  This starts to move us away from the generic
'run_compute_api_method' cells call.

Change-Id: Ib2b28f8446883d825876227f639561a69e8b3308
Merge "Better start/stop handling for cells"
Merge remote-tracking branch 'm_src_repo/citrix-fixes' into build-temp