Moved cluster UUID extraction code to after when 'admin' account is created. The original fix in https://code.launchpad.net/~rodsmith/maas-cert-server/fix-setup-uuid/+merge/274745 introduced a new bug (bug #1507024), which I missed because my original tests were done on systems on which the "admin" account had already been created. This branch moves the code to extract the UUID to a point after which the "admin" account is created.