Extend pmlc localhost detection heuristics
Extend pmlc localhost detection heuristics

This tackles a failure in test qa/381, where we recently
began reporting local: as a remote host name; turned out
we were accidentally avoiding some existing heuristics to
dodge this kind of scenario - fix it up to handle the new
local: and unix: host specifications as well, and ensure
we do not report these to the users as remote pmcd hosts.

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