nfs-utils: Stop rpc.statd correctly

nfs-utils: Stop rpc.statd correctly

An incorrect process name in the nfsserver initscript prevented
rpc.statd from being shut down.

root@qemux86-64:~# /etc/init.d/nfsserver start
creating NFS state directory: done
starting 8 nfsd kernel threads: done
starting mountd: done
starting statd: done

root@qemux86-64:~# ps | grep rpc.statd
  650 root     10532 S    /usr/sbin/rpc.statd
  654 root      4720 S    grep rpc.statd

root@qemux86-64:~# /etc/init.d/nfsserver stop
stopping statd: done
stopping mountd: done
stopping nfsd: done

root@qemux86-64:~# ps | grep rpc.statd
  650 root     10532 S    /usr/sbin/rpc.statd
  662 root      4720 S    grep rpc.statd

As this daemon drops a pid file,simply use that instead.
Also add some initialization checks so the daemons are not
left partially started in the absence of kernel nfsd support.

Signed-off-by: Andy Ross <andy.ross@windriver.com>
Signed-off-by: Qiang Chen <qiang.chen@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>