saml: when no custom certificat chain is given for validating SOAP endpoints, prefer using urllib instead of the custom code written around httplib
saml: when no custom certificat chain is given for validating SOAP endpoints, prefer using urllib instead of the custom code written around httplib

It allows to use http proxies which are not supported by httplib.

Sponsored by http://www.ill.eu/ (Institut Laue-Langevin)

BryceLohr/authentic,pu239ppy/authentic2,BryceLohr/authentic,adieu/authentic2,adieu/authentic2,pu239ppy/authentic2,adieu/authentic2,pu239ppy/authentic2,BryceLohr/authentic,BryceLohr/authentic,pu239ppy/authentic2,adieu/authentic2