This update for python-pysaml2 fixes the following issues:
CVE-2016-10127 and CVE-2016-10149: XXE (XML external entity) issues were fixed in python-pysaml2, where external requests to other XML content could be made by parsing XML files using this SAML2 library. (bsc#1019074)
To fix this bug, the new dependency python-defusedxml was added and is used for sanitizing XML content.