libpcp/pmns.c: final version of the pmLoadNameSpace() changes
libpcp/pmns.c: final version of the pmLoadNameSpace() changes

Removed some bogus code from the preliminary version to expose
the real logic which is:
- pmLoadNameSpace() - never use pmcpp
- pmLoadASCIINameSpace() - if filename is PM_NS_DEFAULT don't use
  pmcpp, otherwise use pmcpp
This avoids pmcpp for most common uses where the default PMNS is,
loaded, and this includes all PM_CONTEXT_LOCAL contexts.

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