[Users] new ovirt-engine-sdk features (form 3.1 till now)

[Michael Pasternak]

-  allow persistent_auth via localhost
-  make /filter header global rather than method driven #857018
-  throw error when connecting to ssl site using http protocol
-  raise NoCertificatesError only when no ca_file specified
-  several rebases to include latest engine features

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Michael Pasternak
RedHat, ENG-Virtualization R&D