nfs-utils: install /etc/nfsmount.conf

Installs /etc/nfsmount.conf on the target, mainly to be able to configure the
the NFS version that mount.nfs uses by default. Without this ability you are
likely to encounter mount errors when automounting directories from NFS
version 3 servers.

Signed-off-by: Jonathan Ben Avraham <yba@tkos.co.il>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>