Description of problem:
if provided wrong option for gluster command for  disperse volume, Usage displays about replica. Could mislead customers. 


[root@aspandey ~]# gluster volume remove-brick gfs  aspandey:/brick/dist/A11 aspandey:/brick/dist/A12 aspandey:/brick/dist/A13 aspandey:/brick/dist/A14 aspandey:/brick/dist/A15 aspandey:/brick/dist/A16 sta
Usage: volume remove-brick <VOLNAME> [replica <COUNT>] <BRICK> ... <start|stop|status|commit|force>
[root@aspandey ~]# 

[root@aspandey ~]# gluster v heal
Usage: volume heal <VOLNAME> [enable | disable | full |statistics [heal-count 
[replica <HOSTNAME:BRICKNAME>]] |info [healed | heal-failed | split-brain] |split-brain {bigger-file <FILE> |source-brick <HOSTNAME:BRICKNAME> [<FILE>]}]

[root@aspandey ~]# gluster v add-brick gfs
Usage: volume add-brick <VOLNAME> [<stripe|replica> <COUNT>] <NEW-BRICK> ... [force]

Version-Release number of selected component (if applicable):
Usage: volume add-brick <VOLNAME> [<stripe|replica> <COUNT>] <NEW-BRICK> ... [force]
[root@aspandey ~]# gluster --version
glusterfs 3.8dev built on Jun 30 2015 18:11:45
Repository revision: git://git.gluster.com/glusterfs.git
Copyright (c) 2006-2011 Gluster Inc. <http://www.gluster.com>
GlusterFS comes with ABSOLUTELY NO WARRANTY.
You may redistribute copies of GlusterFS under the terms of the GNU General Public License.
[root@aspandey ~]#

How reproducible:
100%

Steps to Reproduce:
1.Create disperse volume
2.Provide wrong options for the above commands for disperse volumes

Actual results:
wrong usage information
Expected results:
Usage:  must contain the information about all or targeted "volume type"


Additional info: