Make p2p communication private

[andrevmatos]

Problem Definition

As per #473 and related issues, raised on this comment, we should make sure the communication between nodes is private and secure. Most straightforward approach is to offload this duty to the transport, and for Matrix it means making and ensuring the rooms are private and e2e encrypted

raiden/raiden/network/transport/matrix.py

Lines 673 to 677 in b2e2d35

	room = self._client.create_room(
	room_name,
	invitees=[user.user_id for user in invitees],
	is_public=True, # FIXME: debug only
	)

raiden/raiden/network/transport/matrix.py

Lines 707 to 711 in b2e2d35

	room = self._client.create_room(
	None,
	invitees=[user.user_id for user in invitees],
	is_public=True, # FIXME: debug only
	)

[andrevmatos]

Replaced by #2501