feat: run in cluster mode by default when in production

Close #203

Author: jimlambie

config.js

@@ -400,7 +400,7 @@ var conf = convict({
   cluster: {
     doc: 'If true, CDN runs in cluster mode, starting a worker for each CPU core',
     format: Boolean,
-    default: false
+    default: true
   },
   paths: {
     doc: "",

config/config.development.json.sample

@@ -3,9 +3,7 @@
       "host": "0.0.0.0",
       "port": 80
   },
-
-  // Either directory, s3 or remote should be enabled
-
+  "cluster": false,
   "images": {
     "directory": {
       "enabled": true,
@@ -23,8 +21,6 @@
       "path": ""
     }
   },
-
-  // Either directory, s3 or remote should be enabled
   "assets": {
     "directory": {
       "enabled": true,
@@ -42,12 +38,10 @@
       "path": ""
     }
   },
-
-  // Either directory or redis should be enabled
   "caching": {
     "ttl": 3600,
     "directory": {
-      "enabled": true,
+      "enabled": false,
       "path": "./cache/"
     },
     "redis": {

config/config.production.json.sample

@@ -1,9 +1,8 @@
 {
   "server": {
-      "host": "0.0.0.0",
-      "port": 80
+    "host": "0.0.0.0",
+    "port": 80
   },
-
   "logging": {
     "enabled": true,
     "level": "info",
@@ -15,9 +14,6 @@
       "kinesisStream": ""
     }
   },
-
-  // Either directory, s3 or remote should be enabled
-
   "images": {
     "directory": {
       "enabled": true,
@@ -35,8 +31,6 @@
       "path": ""
     }
   },
-
-  // Either directory, s3 or remote should be enabled
   "assets": {
     "directory": {
       "enabled": true,
@@ -54,12 +48,10 @@
       "path": ""
     }
   },
-
-  // Either directory or redis should be enabled
   "caching": {
     "ttl": 3600,
     "directory": {
-      "enabled": true,
+      "enabled": false,
       "path": "./cache/"
     },
     "redis": {

config/config.qa.json.sample

@@ -1,11 +1,9 @@
 {
   "server": {
-      "host": "0.0.0.0",
-      "port": 80
+    "host": "0.0.0.0",
+    "port": 80
   },
-
-  // Either directory, s3 or remote should be enabled
-
+  "cluster": true,
   "images": {
     "directory": {
       "enabled": true,
@@ -23,8 +21,6 @@
       "path": ""
     }
   },
-
-  // Either directory, s3 or remote should be enabled
   "assets": {
     "directory": {
       "enabled": true,
@@ -42,12 +38,10 @@
       "path": ""
     }
   },
-
-  // Either directory or redis should be enabled
   "caching": {
     "ttl": 3600,
     "directory": {
-      "enabled": true,
+      "enabled": false,
       "path": "./cache/"
     },
     "redis": {

config/config.test.json.sample

@@ -3,6 +3,7 @@
     "host": "0.0.0.0",
     "port": 8111
   },
+  "cluster": false,
   "logging": {
     "enabled": true,
     "level": "info",