Don't ignore errors in Vm#running_processes
Don't ignore errors in Vm#running_processes

The Vm#running_processes method currently logs all errors/exceptions
instead of raising them up.  This causes the tasks to look like they
were successful even though there are warnings in the log about
mis-configuration which should be corrected by the user.

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1534023

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