Fix crash on Python 3 #356
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I'm not sure if that's the best fix for the problem and it won't affect anything else.
Long story short - on Python 3, pysaml2 crashes if metadata is signed.
create_metadata_string(and other methods) sign the string and expect a binary string as a response. ButCryptoBackendXmlSec1.sign_statementforcibly decodes the binary string from xmlsec1 to a normal string.On Python 2 it should not cause any problems as there's no distinction.