Description of problem:
dict_ref and dict_unref were modified to log the refcount and address of the dictionary. It was observed that the refcount of the dict created in volume set handler never becomes 0 (implying the dict is ref'd but never unref'd), when the commands "volume set" and "volume set help" fail in handle.

[root@kd glusterfs]# gluster volume info test
 
Volume Name: test
Type: Distribute
Volume ID: 05581668-d5ee-41cc-94ec-90f747633a28
Status: Created
Number of Bricks: 1
Transport-type: tcp
Bricks:
Brick1: kd:/export2/test1

[root@kd glusterfs]# gluster volume set test performance.write-behind off
volume set: failed: operation failed
volume set: failed

glusterd log:

[2012-09-27 11:21:56.173677] E [dict.c:486:dict_ref] (-->/usr/local/lib/libgfrpc.so.0(rpcsvc_handle_rpc_call+0x2ec) [0x7fde90676d60] (-->/usr/local/lib/glusterfs/3git/xlator/mgmt/glusterd.so(glusterd_handle_set_volume+0xcb) [0x7fde8d689b52] (-->/usr/local/lib/libglusterfs.so.0(dict_new+0x31) [0x7fde9089c66a]))) 0-DICT REF: dict ptr:  0x7fde8f300cc0 refcount = 1


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