Nova consoleauth service fails in HA configuration

Nova consoleauth is a singleton service. In an HA configuration currently
it runs on all the controllers and causes NoVNC to fail intermittently
when it tries to connect to the URL that the API returned to it.

This fix makes consoleauth only run on the bootstrap node.

Change-Id: Ic1803e0b997271b3512e6c62fd75feccb4d9be0a
Merge "Nova consoleauth service fails in HA configuration"