Merge pull request #2594 from kuzzleio/fix/public-started-backend-property

fix: started property from backend should be accessible onto plugins

Author: Juiced66

lib/core/backend/backend.ts

@@ -76,8 +76,7 @@ export class Backend {
   private _kuzzle: any;
   private _name: string;
   private _sdk: EmbeddedSDK;
-
-  protected started = false;
+  private _started: boolean;
 
   protected _pipes = {};
   protected _hooks = {};
@@ -431,6 +430,14 @@ export class Backend {
     };
   }
 
+  get started() {
+    return this._started;
+  }
+
+  protected set started(started: boolean) {
+    this._started = started;
+  }
+
   /**
    * Try to read the current commit hash.
    */