Cluster/DHT: Changing rename log severity

Changing the log level for a rename message from debug
to info to improve debuggability

Change-Id: I53031fcf97fffd62095692477330ecde0cf47dcd
BUG: 1140348
Signed-off-by: Nithya Balachandran <nbalacha@redhat.com>
Reviewed-on: http://review.gluster.org/8582
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
(cherry picked from commit c087e5f634a0b2262118d61ab9c1d5c8e18c8819)
Signed-off-by: Nithya Balachandran <nbalacha@redhat.com>
Reviewed-on: http://review.gluster.org/8730
Reviewed-by: venkatesh somyajulu <vsomyaju@redhat.com>
Reviewed-by: Niels de Vos <ndevos@redhat.com>