Sign the saml response by default

hiboo/sso/saml.py

@@ -180,6 +180,7 @@ def saml_redirect(service_uuid):
         sp_entity_id=service.config["entityid"],
         userid=picked.username,
         authn={'class_ref': saml2.saml.AUTHN_PASSWORD},
+        sign_response=True,
         sign_assertion=True
     )
     return flask.render_template('sso_redirect.html', target=service.config["acs"], data={