cluster/afr: Try for all locks before failing in rename

Change-Id: If0e917e5d4914f6807b4a96f81668a467b15d0df
BUG: 922809
Signed-off-by: Pranith Kumar K <pkarampu@redhat.com>
Reviewed-on: http://review.gluster.org/4689
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>