If a service has both TCP and UDP but the TCP port appears before in the
range loop, it will be considered a UDP-only port and the forwarding
will fail.
Fix that by calculating the difference between UDP ports and TCP ports.
Signed-off-by: Adrian Moreno <amorenoz@redhat.com>
Kubernetes-commit: c194bc85319298e7c2fd002031d0ff23ded54591