add 'stop', 'restart' of services in inst-sys (patch vmoravec)
tests added
version and changelog
refactor
Merge pull request #235 from gabi2/master

add 'stop' and 'restart' of services in inst-sys (bnc #873057, bnc #873448)
Fixed behavior in Mode.update

- Selected products should be used not only in new installation
  but also in update
Extended test case

- Onlt only Installation, but also Update
Changes and version
Simplified according to comments