Description of problem:
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Bitrot command line usage is not correct




Version-Release number of selected component (if applicable):
==============================================================
glusterfs-server-3.7dev-0.1009.git8b987be.el6.x86_64


How reproducible:
====================
Always

Steps to Reproduce:
1. Try to disable the bitrot feature for ginve volume with wrong syntax like
gluster vol bitrot rajesh_test diable
2. As command with wrong syntax has been executed and bitrot usage is poping up but bitrot usage is not correct

[root@rhs-client38 rajesh_test2]# gluster vol bitrot rajesh_test diable
Invalid bit rot option : diable
Usage: volume bitrot <VOLNAME> {scrub pause|resume}


Expected results:
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Usage should be like this :volume bitrot <VOLNAME> {enable|diable} insted of 
volume bitrot <VOLNAME> {scrub pause|resume}


Additional info: