tests (unit): AP gateway unit tests: are covered: - AP actor handle to XMPP JID/pubsub node - XMPP JID/pubsub node to AP actor handle - AP request to JID/pubsub node (AP collection to items/RSM metadata conversion) - pubsub request to AP actor (pubsub request with RSM to AP collection/pagination requests conversion) ticket 363

this certificates are used to enable TLS during tests. Those must be the same as in
backend_e2e (they are generated there)