[systemd] Remove obsoleted ControlGroup from service file

Signed-off-by: Matti Kosola <matti.kosola@jollamobile.com>
Merge pull request #67 from mkosola/master

Remove obsoleted ControlGroup from service file
Version 0.66.3

Signed-off-by: Pekka Lundstrom <pekka.lundstrom@jollamobile.com>