Make ClientUseIPv4 and ClientUseIPv6 equivalent to ReachableAddresses
Once #20996 (moved) is fixed, we should also make ClientUseIPv4 and ClientUseIPv6 work the same as the equivalent ReachableAddresses settings.
For example: ClientUseIPv4 = accept/reject 0.0.0.0/0 = accept/reject *4 ClientUseIPv6 = accept/reject [::]/0 = accept6/reject6 * = accept/reject *6
Bootstrap and guards should also work if ReachableAddresses blocks almost all addresses of a particular type.
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