jicofo: reintroduce shibboleth auth

Fixes #956

jicofo/rootfs/defaults/jicofo.conf

@@ -9,10 +9,17 @@ jicofo {
       // The type of authentication. Supported values are XMPP, JWT or SHIBBOLETH (default).
       {{ if eq $AUTH_TYPE "jwt" }}
       type = JWT
+      {{ else if eq $AUTH_TYPE "shibboleth" }}
+      type = SHIBBOLETH
       {{ else }}
       type = XMPP
       {{ end }}
+      {{ if eq $AUTH_TYPE "shibboleth" }}
+      login-url = "shibboleth:default"
+      logout-url = "shibboleth:default"
+      {{ else }}
       login-url = "{{ .Env.XMPP_DOMAIN }}"
+      {{ end }}
     }
     {{ end }}