python3: Work around httpretty issue
Currently running tox.ini with py33 installation fails because of a failure to read a unicode file while installing httpretty. Closes-Bug: #1241560 Change-Id: I6012c4fcca0d0354f0c1bdf4797f6e7409f7bf1c Signed-off-by: Chuck Short <chuck.short@canonical.com>
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