Fix wrong local.conf link in devstack's README
Fix wrong local.conf link in devstack's README

Change-Id: I642fbdb8fa3b271a2084b6174d5e9808ce622ab7
Signed-off-by: Trinh Nguyen <f87cc599f9e22238e9ddceba1aa34d0d1ff5071f@gmail.com>

openstack/searchlight,openstack/searchlight,openstack/searchlight