driver: revert queue_message_on_peer() to only be meant for forwarding
driver: revert queue_message_on_peer() to only be meant for forwarding

No longer allow the sender to be unset, and let anything that does not
need to potentially register a reply object call into the connection
directly.

Signed-off-by: Tom Gundersen <7c8224529a7c718e876cb2496c973509fde1e50e@jklm.no>

bus1/dbus-broker