[HAPROXY] use $SOURCEIP instead of $PROXIED_SRCIP

[bazsi]

This is an incompatible change, but the old behaviour is rather confusing and difficult to use. The incompatiblity only
affects connections that are coming via a proxy. In that case $PROXIED_SRCIP and friends are not going to be set,
but $SOURCEIP, $DESTIP and $DESTPORT will be present instead.

[github-actions]

This Pull Request introduces config grammar changes

axoflow/9d25570002aaa3c97d7275d119270bd68a6b45d2 -> bazsi/haproxy-use-sourceip-instead-of-proxied-srcip

--- a/destination
+++ b/destination

 network(
     transport(
+        auto
     )
 )

 syslog(
     transport(
+        auto
     )
 )

--- a/source
+++ b/source

 network(
     transport(
+        auto
     )
 )

 syslog(
     transport(
+        auto
     )
 )