xfsprogs: Fix up usage() errors and omissions

xfsprogs: Fix up usage() errors and omissions

Add missing options and remove invalid options in usage() output
strings.

* Add -V to several usage() strings
* Remove deprecated/invalid -n and -s otions from xfs_fsr's usage
* Remove invalid -I option from xfs_growfs's usage
* Add -n (O_NONBLOCK) option to xfs_io's usage
* Add -e (exit on error) option to xfs_logprint's usage
* Remove invalid -b option from xfs_mdrestore's usage
* Add -N (no-op), -K (no discard), and -f (force) to mkfs.xfs's usage
* Add -x (expert) option to xfs_quota's usage

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Rich Johnston <rjohnston@sgi.com>
Signed-off-by: Rich Johnston <rjohnston@sgi.com>