Deprecate "admin/reload"-endpoint (#255)

The endpoint isn't used by ringpop-admin and, according to our internal metrics, has never been called in production.
Triggering a reload was probably useful during testing when the bootstrap file changed. With partition healing, we achieve a similar result in that the discover provider will be re-queried, except that it's automatic.

server/admin/index.js

@@ -50,6 +50,7 @@ var baseEndpointHandlers = {
         endpoint: '/admin/lookup',
         handler: require('./lookup.js')
     },
+    // Deprecated!
     reload: {
         endpoint: '/admin/reload',
         handler: require('./reload.js')

server/admin/reload.js

@@ -22,6 +22,10 @@
 
 module.exports = function createReloadHandler(ringpop) {
     return function handleReload(arg1, arg2, hostInfo, callback) {
+        ringpop.logger.warn('ringpop endpoint is deprecated: /admin/reload', {
+            local: ringpop.whoami(),
+            hostInfo: hostInfo
+        });
         var body = arg2;
         if (body && body.file) {
             ringpop.reload(body.file, function(err) {