Comment 3 for bug 1585275

We are now seeing on undercloud almost every run:

[1;31mError: Could not prefetch mysql_user provider 'mysql': Execution of '/usr/bin/mysql -NBe SELECT CONCAT(User, '@',Host) AS User FROM mysql.user' returned 1: ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2 \"No such file or directory\")
Error: Could not prefetch mysql_database provider 'mysql': Execution of '/usr/bin/mysql -NBe show databases' returned 1: ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2 \"No such file or directory\")