qa: extend http request filter for 780/782 determinism
qa: extend http request filter for 780/782 determinism

Newer versions of libmicrohttpd (f20+) have additional
diagnostic messages, and add the Connection: Keep-Alive
header to all responses too.

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