**Steps to reproduce**
* Go to https://gerrit.wikimedia.org/r/#/c/269709/
* Do recheck in comment.
* Then wait for the test to run and jenkins to report back.
Errror is on slave
slave ( integration-slave-trusty-1021 ) as well as date of event ( 12:16:09 UTC ) and the error "DB connection error: Access denied for user 'jenkins_u0'@'localhost' (using password: YES) (127.0.0.1:3306)"
* It fails with this error
16:01:26 DB connection error: Access denied for user 'jenkins_u0'@'localhost' (using password: YES) (127.0.0.1:3306).
16:01:26 Check the host, username and password and try again.
I'm not sure weather it happends on other slaves.
* MySQL should successfully install the db and there should not be db access issue.