Update driver to use webaudit.unl.edu

Webaudit.unl.edu is now the official source of registry information.  the 'manager' role in webaudit.unl.edu has been changed to 'admin', so reflect that mapping change here.
The 'manager' role in webaudit.unl.edu has been changed to 'admin', so reflect that mapping change here.
The key is no longer the uid
Use the new user query syntax
Merge pull request #343 from mfairchild365/registry-sitemaster

Use webaudit.unl.edu as the registry source