Fix kolab container setup

Summary:

• Use the "kolab" password for the HKCCP database by default (like we assume in

other places)

• Create a user that is accessible via 127.0.0.1. The UPDATE command

does not work with a recent mariadb because the user table has become a
view.

Reviewers: #hkccp_developers, vanmeeuwen

Reviewed By: #hkccp_developers, vanmeeuwen

Differential Revision: https://git.kolab.org/D2407