Description of problem:
=====================
On creating a CG with same volume name , snapshot create command fails with the below error message : 

gluster snapshot create volume1 volume1 -n Cons_Grp1 -d "this is new CG"
snapshot create: failed: Another transaction is in progress. Please try again after sometime.
Snapshot command failed

Display a clear message stating the reason for the failure : 

gluster snapshot create volume1 volume1 -n Cons_Grp1 -d "this is new CG"
snapshot create: failed:Please specify different volume names while creating CG
Snapshot command failed

Version-Release number of selected component (if applicable):
=============================================================
glusterfs 3.4.0.snap.dec03.2013git

How reproducible:
================
always


Steps to Reproduce:
==================
1.Create 2 distribute replicate volume (volume1 volume2) and start it 

2.Create a CG only with volume1 as below : 

gluster snapshot create volume1 volume1 -n Cons_Grp1 -d "this is new CG"
snapshot create: failed: Another transaction is in progress. Please try again after sometime.
Snapshot command failed


Actual results:
==============
gluster snapshot create volume1 volume1 -n Cons_Grp1 -d "this is new CG"
snapshot create: failed: Another transaction is in progress. Please try again after sometime.
Snapshot command failed


Expected results:
================

gluster snapshot create volume1 volume1 -n Cons_Grp1 -d "this is new CG"
snapshot create: failed:Please specify different volume names while creating CG
Snapshot command failed

Additional info: