Add "requires" handlers to all non-trivial routes

This commit is the result of an audit to add user levels to the various
components that need them.  As written:

KVM requires admin privilege
Virtual media requires admin privilege
image upload requires admin privilege
/subscribe API requies Login privilege

Signed-off-by: Ed Tanous <ed.tanous@intel.com>
Change-Id: I6384f23769a5ac23f653519656721da7373f088f
diff --git a/include/dbus_monitor.hpp b/include/dbus_monitor.hpp
index 662d3c6..0543c7b 100644
--- a/include/dbus_monitor.hpp
+++ b/include/dbus_monitor.hpp
@@ -114,6 +114,7 @@
 template <typename... Middlewares> void requestRoutes(Crow<Middlewares...>& app)
 {
     BMCWEB_ROUTE(app, "/subscribe")
+        .requires({"Login"})
         .websocket()
         .onopen([&](crow::websocket::Connection& conn) {
             BMCWEB_LOG_DEBUG << "Connection " << &conn << " opened";