Fix all the Test::Smoke::Poster::* code that use Modules.
Fix Test::Smoke::App::SmokePerl
Make this test a bit saver to run...
Fix some more errors.
  * use Test::Smoke::SysInfo::Windows->new->os for Windows version
  * import of cwd() from Cwd.
  * Make LWP::UserAgent the default poster() again.