Merge pull request #106 from aplanas/master

Make memtest and checkmedia important tests.
avoid packagekit interferring consoletests

we mask the service in _setup and unmask it in _finish
Merge pull request #107 from os-autoinst/coolo_avoid_packagekit

avoid packagekit interferring consoletests
small fixes for the packagekit change
Merge pull request #108 from os-autoinst/coolo_avoid_packagekit

small fixes for the packagekit change
use sudo for packagekit