Change procd_add_start_mount_trigger to procd_add_restart_mount_trigger
and make it call 'restart' instead of 'start'.
This is more useful as it allows to handle both cases, intial start of
a services as well as restarting services. Calling 'restart' on a
service which has not yet been started has the same result as calling
'start'.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>