…repo defined by DEVEL_REPO_rhelX variable

Most important is using --auth-root-authentication-method=normal which
changed the default value since 10.5 and while we don't use root acount
inside the container, we cannot use the new functionality that depends
on being a superuser after initialization of the datadir.

The replication test changes check of whether the slave has data from
the master.

From some unknown reason this makes the user permissions not being replicated on 10.5 and further.

It seems that filtering on mysql name was not supposed to be working anyway according to
https://jira.mariadb.org/browse/MDEV-5704

And there were some changes done in 10.4 that might be related:
https://jira.mariadb.org/browse/MDEV-17658

Anyway, there is probably no reason to limit the databases replicated by default.

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