Map test maintainer contact to GitLab username
Changing the format in data to be able to support gitlab usernames. Used Succession for backwards compatibility with the old format. Which should eventually be removed.
Conditionals in the #25 should be discussed. As in, Beaker XML output format and command for showing info about tests.
This shouldn't be merged before the kpet-db MR 187!
CCs: @spbnick, @veruu, @inakimalerba, @jracek