package/nfs-utils: start/stop daemons consistently

package/nfs-utils: start/stop daemons consistently

Change init script to start and stop all nfs daemons in a consistent
way. Using the same kill command, start/stop the daemon, printout OK or
FAIL and touch or deleted necessary files.

Signed-off-by: Andreas Ehmanns <universeII@gmx.de>
[Maxime:
   - Make it really consistent to stop the daemons as pointed out by
     Yann E. Morin
   - Remove the -9]
Signed-off-by: Maxime Hadjinlian <maxime.hadjinlian@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>