umt testflinger: only query c3 API for known testflinger machines
The c3 API allows to query for a list of IDs so ask it only for those which we
have looked up previously from testflinger. This saves a lot of unnecessary
queries.
umt: supplement testflinger queues with c3 machine descriptions
certification.canonical.com (c3) stores details on all the various machines that
have been tested by the Devices Certification team. This includes most of the
machines in the testflinger queues - some of which do not have any description
listed. So fetch this information from the c3 API and augment the list of
testflinger queues with it.
build-tools/umt: ensure binaries installed if using skeleton qrt test
The skeleton.py QRT script doesn't specify any QRT-Packages and so the packages
under test may never get installed at all since later steps always run apt with
--only-upgrade which then only will upgrade the package if it is already
installed. Instead, edit this in place on the VM so that it installs all the
binary packages built by the current source package.
