Fixes NPE when NetworkingModule runs onCatalystInstanceDestroy

Reviewed By: andreicoman11

Differential Revision: D3328278

fbshipit-source-id: 7cf43a4564b2b799b13307f8604eb48e5c512379

ReactAndroid/src/main/java/com/facebook/react/common/network/OkHttpCallUtil.java

@@ -32,4 +32,8 @@ public class OkHttpCallUtil {
       }
     }
   }
+  
+  public static void cancelAll(OkHttpClient client) {
+    client.dispatcher().cancelAll();
+  }
 }

ReactAndroid/src/main/java/com/facebook/react/modules/network/NetworkingModule.java

@@ -138,7 +138,7 @@ public final class NetworkingModule extends ReactContextBaseJavaModule {
   @Override
   public void onCatalystInstanceDestroy() {
     mShuttingDown = true;
-    OkHttpCallUtil.cancelTag(mClient, null);
+    OkHttpCallUtil.cancelAll(mClient);
 
     mCookieHandler.destroy();
     mCookieJarContainer.removeCookieJar();