rem: usr: Remove "port" from source address options
Remove the use of "port" when configuring query-source(-v6), transfer-source(-v6), notify-source(-v6), parental-source(-v6), etc. Remove the use of source ports for parental-agents.
Also remove the deprecated options use-{v4,v6}-udp-ports and avoid-{v4,v6}udp-ports.
Closes #3843 (closed)