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[9.20] fix: dev: Don't enable REUSEADDR on outgoing UDP sockets

bind-team-rw-api-rw-repo requested to merge backport-ondrej/fix-outgoing-UDP-port-selection-9.20 into bind-9.20

The outgoing UDP sockets enabled SO_REUSEADDR that allows sharing of the UDP sockets, but with one big caveat - the socket that was opened the last would get all traffic. The dispatch code would ignore the invalid responses in the dns_dispatch, but this could lead to unexpected results.

Backport of MR !9569 (merged)

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