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()
ah, ok.  The 'None' part was flagged as an error in PyCharm since the host param is expected to be a string.  Maybe pass an empty string here?  Or perhaps we should update the docstring in the AWSAuthConnection class.