BUG/MINOR: tcp-act: Don't forget to set the original port for IPv4 set-dst rule

BUG/MINOR: tcp-act: Don't forget to set the original port for IPv4 set-dst rule

If an IPv4 is set via a TCP/HTTP set-dst rule, the original port must be
preserved or set to 0 if the previous family was neither AF_INET nor
AF_INET6. The first case is not an issue because the port remains the
same. But if the previous family was, for instance, AF_UNIX, the port is not
set to 0 and have an undefined value.

This patch must be backported as far as 1.7.

(cherry picked from commit e01ca0fbc9c72de95514816e016a58c5a28ab2a8)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
(cherry picked from commit 3a6133a3b7eff777f0c7bee0f000a763cf2ec971)
[cf: Changes applied in src/proto_tcp.c]
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
(cherry picked from commit 7defd7020b188afb82cc20b7d63d5dba4ac756a4)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>