QA 667: tweak socat options
QA 667: tweak socat options

Now works also on FreeBSD 12, no regressions seen elsewhere (so far).

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp