Persistent guest mount linux

    After the change where the provisioning is only run the first 'boot' or
    forced we have encoutered some issues of services not starting because
    of the files/folders were missing due to the shared folders to the host
    were not yet there during startup.
    
    Example:
    - website folder shared with guest
    - guest starts
    - apache starts, website folder does not exist, apache fails
    - no provisioning, so after mounting the shares apache is still down
    - result: we have a 'non-working' system
    
    This is only a patch for linux guests, but it solves the described
    problem.