Add server roles on topology page

Adds new tab on topology page which shows server roles. Also extends
server details page and server config page (setting of ca renewal server).

https://fedorahosted.org/freeipa/ticket/5906

Reviewed-By: Petr Vobornik <pvoborni@redhat.com>

ipaserver/plugins/internal.py

@@ -660,6 +660,10 @@ class i18n_messages(Command):
                 "specified_users": _("Specified Users and Groups"),
                 "user": _("User"),
             },
+            "server_role": {
+                "label": _("Server Roles"),
+                "label_singular": _("Server Role"),
+            },
             "service": {
                 "auth_indicators": _("Authentication indicators"),
                 "auth_indicator": _("Authentication indicator"),