nfs support for busybox mount

[Eric Delaunay <delaunay@lix.polytechnique.fr>]

Hello all,

  I added nfs support to busybox mount and removed the dependency from
dbootstrap to busybox mount.o object by replacing all mount_one() calls by
system("mount ...").
I'm doing intensive tests now but I experience some troubles with nfs.
The kernel is emiting such king of messages:
<4>lockd_up: makesock failed, error=-61
<4>portmap: RPC call returned error 61
<4>RPC: tack of released request still queued!
<4>RPC: (task is on xprt_pending)
<4>lockd_down: no lockd running

I need to investigate a bit further before commiting these changes.
Btw, I also get weird things every now and then with mount from util-linux.

Good night.

PS: there is still one depedency between dbootstrap & busybox on utility.c.
    dbootstrap is using the recusiveAction function but the whole code in
    utility.c is much larger than recusiveAction itself.
    I suggest to duplicate this code in dbootstrap instead of crosslinking with
    busybox.

-- 
 Eric Delaunay                 | "La guerre justifie l'existence des militaires.
 delaunay@lix.polytechnique.fr | En les supprimant." Henri Jeanson (1900-1970)