qa/667: change from nc to socat
qa/667: change from nc to socat

For improved portability.
Also more comprehesive diagnostics to 667.full for debugging.

andyvand/cygpcpfans,tjanez/pcp,adfernandes/pcp,tjanez/pcp,prasincs/pcp,aeg-aeg/pcpfans,wuliming/pcp,aeg-aeg/pcpfans,edwardt/pcp,adfernandes/pcp,tjanez/pcp,edwardt/pcp,andyvand/cygpcpfans,prasincs/pcp,prasincs/pcp,tjanez/pcp,prasincs/pcp,wuliming/pcp,aeg-aeg/pcpfans,aeg-aeg/pcpfans,prasincs/pcp,wuliming/pcp,edwardt/pcp,adfernandes/pcp,andyvand/cygpcpfans,prasincs/pcp,tjanez/pcp,tjanez/pcp,adfernandes/pcp,prasincs/pcp,andyvand/cygpcpfans,tjanez/pcp,wuliming/pcp,wuliming/pcp,adfernandes/pcp,andyvand/cygpcpfans,wuliming/pcp,aeg-aeg/pcpfans,andyvand/cygpcpfans,adfernandes/pcp,andyvand/cygpcpfans,edwardt/pcp,wuliming/pcp,adfernandes/pcp,aeg-aeg/pcpfans,edwardt/pcp,aeg-aeg/pcpfans,wuliming/pcp,prasincs/pcp,adfernandes/pcp,aeg-aeg/pcpfans,tjanez/pcp,edwardt/pcp,edwardt/pcp,edwardt/pcp,andyvand/cygpcpfans