fix(ci): bound the apt network steps with timeouts and retries

The PR test job ran apt-get against the xcat.org repository with no
time limit of its own. When the repository stalled, the job hung on the
update step until the sixty minute workflow limit canceled the run, and
the log gave no reason.

Wrap the apt-get update and install steps in a timeout command and give
apt a transfer timeout with retries. A stalled repository now fails the
step in minutes, the driver prints its install error report, and a
rerun is possible at once.