Bug#858163: unblock: gitlab/8.13.11+dfsg-6

[Ansgar Burchardt <ansgar@debian.org>]

Hi,

> You probably want something like:
>
> """
>   if su ${gitlab_user} -c 'psql gitlab_production -c ""'; then
>      su postgres -c "dropdb gitlab_production"
>   fi
> """

I believe maintainer scripts (and various other parts) should use
`runuser` instead of `su`.  It does not open PAM sessions which seems
to sometimes cause problems.

`/sbin/runuser` is already available in Jessie, so there should be no
issues with using it.

(Maybe one should add something to Policy about `runuser`?)

Ansgar