Salt minion cache can be incomplete after initial installation. As it was
reported in #2213, just `qubesctl saltutil.sync_all` isn't enough to
refresh it in some cases - it may still lack of some files
(ext_module_qvm.py in this case). So, clear the cache completely before
initial configuration.
FixesQubesOS/qubes-issues#2213
Salt-minion config is no longer generated using 'state.sls config', so
remove references to it. Instead make sure all modules are up to date in
cache (saltutil.sync_all).
Also make sure 'salt-minion' service is disabled (it is no longer
handled by config formula).
Additionally dom0 states are no longer in separate environment.
Slightly improve logging.
This service suspends virtual machines at shutdown time and resumes them
at start-up time. This unfortunately breaks virtual machines which have
PCI devices attached.
