hls: instantiate stream-controller after abr-controller

fix startLevel=-1 not working since v0.7.0
FRAG_LOADED event needs to be handled first in abr-controller so that nextAutoLevel will return the correct value when stream-controller will pick it up
relying on listener order is not satisfactory, we need to sync of a better way ...

src/hls.js

@@ -89,6 +89,15 @@ class Hls {
     this.off = observer.off.bind(observer);
     this.trigger = observer.trigger.bind(observer);
 
+    // core controllers and network loaders
+    const abrController = this.abrController = new config.abrController(this);
+    const bufferController  = new config.bufferController(this);
+    const capLevelController = new config.capLevelController(this);
+    const fpsController = new config.fpsController(this);
+    const playListLoader = new PlaylistLoader(this);
+    const fragmentLoader = new FragmentLoader(this);
+    const keyLoader = new KeyLoader(this);
+
     // network controllers
     const levelController = this.levelController = new LevelController(this);
     const streamController = this.streamController = new StreamController(this);
@@ -99,19 +108,8 @@ class Hls {
     if (Controller) {
       networkControllers.push(new Controller(this));
     }
-
     this.networkControllers = networkControllers;
 
-    // core controllers and network loaders
-    // hls.abrController is referenced in levelController, this would need to be fixed
-    const abrController = this.abrController = new config.abrController(this);
-    const bufferController  = new config.bufferController(this);
-    const capLevelController = new config.capLevelController(this);
-    const fpsController = new config.fpsController(this);
-    const playListLoader = new PlaylistLoader(this);
-    const fragmentLoader = new FragmentLoader(this);
-    const keyLoader = new KeyLoader(this);
-
     let coreComponents = [ playListLoader, fragmentLoader, keyLoader, abrController, bufferController, capLevelController, fpsController ];
 
     // optional audio track and subtitle controller