Add novnc to available repos
This should allow devstack to deploy novnc from source when
NOVNC_FROM_PACKAGE is False.
- gnocchixyz/gnocchi
- gtest-org/ansible
- kubernetes-incubator/kubespray
+ - novnc/novnc
- openvswitch/ovs
- pytest-dev/pytest-testinfra
- sigmavirus24/github3.py
