Updated openstack/openstack
Project: openstack-dev/devstack  d94de1fd726dfcc272f9f464db67ac64cb7c4e1b
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Fix noVNC git repo

Recent change switched base git URL to git.openstack.org.
However, noVNC is only hosted on GitHub.
Change git repo URL for noVNC back to the GitHub one.

Change-Id: Iaa9f570639301be1c29cc400c1c73afcbf637b70