make endpoint configuration consistent

[leifj]

frontend and backend saml plugins specify endpoints in different and inconsistent way

[peppelinux]

Hi @leifj, I think that I found a similar problem configuring my satosa instance. In particular I'd need to configure the index value (and if available also the isDefault attribute), in this:

        endpoints:
          assertion_consumer_service:
          - [<base_url>/<name>/acs/post, 'urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST']

I opened an issue on pySAML2 about this, see. Is this the same problem you faced, or part of it?