6663585 'zfs unshare' & 'zfs unmount' should only support 'filesystem' or 'mountpoint' as argument

[sachin.gaik...@sun.com]

Author: Sachin Gaikwad <Sachin.Gaikwad at Sun.COM>
Repository: /hg/onnv/onnv-gate
Latest revision: 78eaaa8a734714f8ae30257f0a0d01e0048f4a8d
Total changesets: 1
Log message:
6663585 'zfs unshare' & 'zfs unmount' should only support 'filesystem' or 
'mountpoint' as argument

Files:
        update: usr/src/cmd/zfs/zfs_main.c