fog/fog — pull request #782 by ktheory (2012-03-08 15:35:01+00:00)
Title: Fix cloudstack warning

On ruby 1.8.7 or REE, I get warnings like this whenever I require fog:

lib/fog/cloudstack.rb:11: warning: already initialized constant DIGEST

This patch fixes the warning by using a module variable instead of a constant. The mocked cloudstack tests pass.