(FACT-321) Remove interpreter arg for command execution
(FACT-321) Remove interpeter arg from resolution
(FACT-321) Remove deprecated interpreter from resolution
(FACT-321) Remove deprecated 'memorytotal' fact
(FACT-321) Remove deprecated Resolution#to_s()
(FACT-321) Remove ENV['DESTDIR'] and --test from install.rb
(FACT-321) Remove deprecated windows shell builtin execution
(FACT-321) Remove deprecated file extension expansion

This commit removes the automatic expansion of Windows commands that
have an absolute path but do not have a file extension.
Merge pull request #631 from adrienthebo/maint/facter-2/remove-deprecations

Maint/facter 2/remove deprecations