Fix 3rd party triggering us to talk with another peer on their room
Fix 3rd party triggering us to talk with another peer on their room

The invite system allowed an attacker to pull us to a room between it
and one of our peers, and we'd join and start talking on that room with
that peer, allowing the attacker to eavesdrop on our communication.
This commit, when operating in private room mode (config), makes us use
exclusively rooms which were either created by us with that peer or
invited specifically by them, also filtering by room privacy

hackaugusto/raiden,hackaugusto/raiden