Make results of application codec and swagger doc desc consistent

Application codec returns permissions, requiredApps and features
in string format. However, based on swagger doc, the codec is
supposed to return array. This commit fixes the type inconsistent
issue raised in application rest api.

Change-Id: If47338b287518a981c98ff89ca543802579c7610

@@ -15,6 +15,7 @@
  */
 package org.onosproject.codec.impl;
 
+import com.fasterxml.jackson.databind.node.ArrayNode;
 import com.fasterxml.jackson.databind.node.ObjectNode;
 import org.apache.commons.lang3.StringEscapeUtils;
 import org.onosproject.app.ApplicationService;
@@ -33,7 +34,16 @@ public final class ApplicationCodec extends JsonCodec<Application> {
     public ObjectNode encode(Application app, CodecContext context) {
         checkNotNull(app, "Application cannot be null");
         ApplicationService service = context.getService(ApplicationService.class);
-        return context.mapper().createObjectNode()
+
+        ArrayNode permissions = context.mapper().createArrayNode();
+        ArrayNode features = context.mapper().createArrayNode();
+        ArrayNode requiredApps = context.mapper().createArrayNode();
+
+        app.permissions().forEach(p -> permissions.add(p.toString()));
+        app.features().forEach(f -> features.add(f));
+        app.requiredApps().forEach(a -> requiredApps.add(a));
+
+        ObjectNode result = context.mapper().createObjectNode()
                 .put("name", app.id().name())
                 .put("id", app.id().id())
                 .put("version", app.version().toString())
@@ -42,11 +52,14 @@ public final class ApplicationCodec extends JsonCodec<Application> {
                 .put("readme", StringEscapeUtils.escapeJson(app.readme()))
                 .put("origin", app.origin())
                 .put("url", app.url())
-                .put("permissions", app.permissions().toString()) // FIXME: change to an array
                 .put("featuresRepo", app.featuresRepo().isPresent() ?
                         app.featuresRepo().get().toString() : "")
-                .put("features", app.features().toString()) // FIXME: change to an array
-                .put("requiredApps", app.requiredApps().toString()) // FIXME: change to an array
                 .put("state", service.getState(app.id()).toString());
+
+        result.set("features", features);
+        result.set("permissions", permissions);
+        result.set("requiredApps", requiredApps);
+
+        return result;
     }
 }

@@ -53,7 +53,7 @@
     "permissions": {
       "type": "array",
       "xml": {
-        "name": "hosts",
+        "name": "permissions",
         "wrapped": true
       },
       "items": {

@@ -53,7 +53,7 @@
     "permissions": {
       "type": "array",
       "xml": {
-        "name": "hosts",
+        "name": "permissions",
         "wrapped": true
       },
       "items": {

@@ -66,7 +66,7 @@
           "permissions": {
             "type": "array",
             "xml": {
-              "name": "hosts",
+              "name": "permissions",
               "wrapped": true
             },
             "items": {