Windows Spec Fixes

There are two windows spec failures in CI: 

1-) client_spec.rb fails because of the gem version changes Process.respond_to?(:fork) is not returning true anymore on windows. We've previously fixed this in 11-stable and related changes are merged over. 
2-) rest_spec.rb fails when closing the tempfile when temp file doesn't exist. This is also fixed in 11-stable and related changes are merged over.