try to create an user in gerrit for mq-worker
try to create an user in gerrit for mq-worker

relies on the batch_admin feature of the gerrit cookbook

if admin user able to connect it will be used to create a user for the
mq-worker

if admin user can't connect we throw an exception

TYPO3-cookbooks/site-reviewtypo3org,TYPO3-cookbooks/site-reviewtypo3org,TYPO3-cookbooks/site-reviewtypo3org,TYPO3-cookbooks/site-reviewtypo3org