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And add tests for all the mode changes

fix #2886

As the doc says, the nick changes must be explicit in an already joined
room, and not when joining a room.

After printing the message, it calls “call_soon(run_scenario)”, and
sometimes, if a stanza handler has already been queued, then that handler
will be called BEFORE the “run_scenario” function could be run, and so no
stanza_checker had the possibility to be set.

fix #3171

fix #3216

This reverts commit a4d67ce0.

Also, some tests that were raising some exception and thus were not ran at all

fix #3213

fix #3069

fix #3210

ref #2948

Also add a e2e test for the list query

fix #3209

At the moment, result-set-management is not implemented, the whole history
(well, at most 1024 messages) is returned.