Fix typo 'NFS server' -> 'NFS' and misleading (C) info

The new nfs plug-in is intended for NFS client information (or
information relevant to both clients and servers). Remove the
word 'server' from the module description.

The copyright line was also incorrectly duplicated from the
original nfsserver module.

Signed-off-by: Bryn M. Reeves <bmr@redhat.com>
Collect additional nfs-client relevant files

Additional NFS client-side data collection:

    "/etc/nfsmount.conf",
    "/proc/fs/nfsfs/servers",
    "/proc/fs/nfsfs/volumes"

Signed-off-by: Bryn M. Reeves <bmr@redhat.com>
Merge branch 'bmr-rhel-6-nfs-client' into rhel-6