modify the default url of noVNC

i had sync the all repos of devstack for installing in intranet
environment, and found the url of noVNC had changed to
https://github.com/novnc/noVNC. This module upgrade from individual to
an organization. the old url had redirect to the new one.

Change-Id: I19fc1e2ad30dcd97cad232c9ad58f53a523616b4

Author: linxuhua

stackrc

@@ -624,7 +624,7 @@ IRONIC_PYTHON_AGENT_REPO=${IRONIC_PYTHON_AGENT_REPO:-${GIT_BASE}/openstack/ironi
 IRONIC_PYTHON_AGENT_BRANCH=${IRONIC_PYTHON_AGENT_BRANCH:-master}
 
 # a websockets/html5 or flash powered VNC console for vm instances
-NOVNC_REPO=${NOVNC_REPO:-https://github.com/kanaka/noVNC.git}
+NOVNC_REPO=${NOVNC_REPO:-https://github.com/novnc/noVNC.git}
 NOVNC_BRANCH=${NOVNC_BRANCH:-stable/v0.6}
 
 # a websockets/html5 or flash powered SPICE console for vm instances