Improve setup provisioning task

Update yum call to not ask for confirmation, update required packages
and silent some commands outputs. Also drop call to network start in
favor of later restart.
The restart on line 537 is enough for this task work. Calling start here was causing some issues. https://github.com/SatelliteQE/automation-tools/pull/73/files#diff-65218180447789ae9b6a89838c1966c9L537