mysql-support not installed on docker-image

[chymian]

even so, mysql-support (sope4.9-gdl1-mysql) was added to the dockerfile at Feb. 15, the actual image on hub.docker.com build today (11. May 2016) has it not installed and the HUB is still working with the old dockerfile.

[JensErat]

You're right, I messed up in pullting the change to all git branches.

Within the next few days, I'll publish an updated Dockerfile and image for SOGo 2 and 3, rebuild to match best practices. MySQL-support will definitely be included in every image then.