Revert "cluster/dht: Added code to capture races in dht-lookup path"

This reverts commit 226ea315d7ff63548b1163966e24f80a5e1641ab

Change-Id: I463793bbe17d3a852e97223960e4647586b34237
Reviewed-on: http://review.gluster.org/8667
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
Tested-by: Vijay Bellur <vbellur@redhat.com>