uwsgit_it_api: fix all metrics tests
uwsgit_it_api: fix all metrics tests

Using the correct container uid.
While at it create actual metrics models so that a more useful path
is excercised.

Mikrobit/uwsgi.it,Mikrobit/uwsgi.it,Mikrobit/uwsgi.it,unbit/uwsgi.it,unbit/uwsgi.it,unbit/uwsgi.it,Mikrobit/uwsgi.it,unbit/uwsgi.it