Madde: Some Fremantle fixes for bugs introduced in recent refactorings.

- Enable remote mounts in run-only mode.
- Fix state machine of remote mounter.
- Suppress mount-related output for Harmattan projects.
- Do not use the df command's -P option, because Fremantle's busybox
does not understand it.

Change-Id: I8d8c96a67896238eb8a57a4dc3aedacd41ed7ab9
Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>