Werk #14765: mk_mongodb.py: primary host is listed under active secondaries

The plugin "mk_mongodb.py" provides the section "mongodb_replica", which contains information on the MongoDB primary, secondaries, and arbiters. The primary host was listed as both primary and active secondary. This is also shown in the corresponding check, "mongodb_replica". This has been fixed.

The fix requires that the agent plugin, "mk_mongodb.py", is updated on the relevant hosts.

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