GUI-129: support ssl cert verification for eucalyptus connections

converted EucaAuthenticator to use httplib (like boto) so that we could re-use the CertValidatingHTTPSConnection boto uses for cert validation.
Use EucaAuthenticator directly instead of going through views/__init__.py:get_connection()
I kept it there as an indicator to future modifiers of the code that it isn't to be used. Maybe that and a comment? I'm not just thinking of the code now, but of future maintainers.