cryptography < 2.2 ; python_version < "2.7" # cryptography 2.2+ requires python 2.7+

cryptography < 2.2 ; python_version < "2.7" # cryptography 2.2+ requires python 2.7+
pyopenssl < 18.0 ; python_version < "2.7" # pyopenssl 18.0+ requires python 2.7+

Fix uri test on Python 2.6.
Fix uri test on Python 2.6.
