PowerDNS/pdns — pull request #1337 by flygoast (2014-03-20 10:49:50+00:00)
Title: logging socket file name when using gmysql-socket instead of gmysql-host

Avoid logging empty host name when using `gmysql-socket`. Such as this
```shell
Mar 20 18:48:02 gmysql Connection successful. Connected to database 'powerdns' on ''.
```