Revert "redis: add optional flag"

This reverts commit 0cac5610c8.

src/addons.js

@@ -1835,8 +1835,6 @@ function setupRedis(app, options, callback) {
     assert.strictEqual(typeof options, 'object');
     assert.strictEqual(typeof callback, 'function');
 
-    if (app.servicesConfig['redis'] && app.servicesConfig['redis'].disabled) return appdb.unsetAddonConfig(app.id, 'redis', callback);
-
     const redisName = 'redis-' + app.id;
 
     appdb.getAddonConfigByName(app.id, 'redis', '%REDIS_PASSWORD', function (error, existingPassword) {
@@ -1903,8 +1901,6 @@ function clearRedis(app, options, callback) {
     assert.strictEqual(typeof options, 'object');
     assert.strictEqual(typeof callback, 'function');
 
-    if (app.servicesConfig['redis'].disabled) return callback(null);
-
     debugApp(app, 'Clearing redis');
 
     getContainerDetails('redis-' + app.id, 'CLOUDRON_REDIS_TOKEN', function (error, result) {
@@ -1959,8 +1955,6 @@ function restoreRedis(app, options, callback) {
     assert.strictEqual(typeof options, 'object');
     assert.strictEqual(typeof callback, 'function');
 
-    if (app.servicesConfig['redis'].disabled) return callback(null);
-
     debugApp(app, 'Restoring redis');
 
     callback = once(callback); // protect from multiple returns with streams