Update rfc.sh to release-3.6

Change-Id: I4421b2891309d797d8fb7c14d1eb78e483453660
Signed-off-by: Vijay Bellur <vbellur@redhat.com>
Reviewed-on: http://review.gluster.org/8328
Tested-by: Gluster Build System <jenkins@build.gluster.com>