GUACAMOLE-1780: Allow SAML, SSL sessions to be resumed after another auth provider vetoes the auth attempt.

extensions/guacamole-auth-sso/modules/guacamole-auth-sso-saml/src/main/resources/guac-manifest.json

@@ -9,6 +9,10 @@
         "org.apache.guacamole.auth.saml.SAMLAuthenticationProvider"
     ],
 
+    "listeners" : [
+        "org.apache.guacamole.auth.saml.AuthenticationEventListener"
+    ],
+
     "css" : [
         "styles/sso-providers.css"
     ],