New webdrivers expect different configuration for hub

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Grid extras specifies hubHost and hubPort, but new selenium configurations expect a single "hub" element with the fully qualified host/port like:
"hub": "http://somehostname:4444"

instead of
"hubHost": "somehostname", "hubPort": 4444
It appears grid extras is incapable of handling the "hub" element alone, and the webdriver is incapable of handling both "hub" and "hubHost/hubPort" at the same time.