Move HttpEngineTest to ctesque.

Should run as a platform test and also as in
instrumentation test.

robolectric/src/test/java/org/robolectric/android/HttpEngineTest.java → integration_tests/ctesque/src/sharedTest/java/android/net/http/HttpEngineTest.java

@@ -1,7 +1,6 @@
-package org.robolectric.android;
+package android.net.http;
 
 import android.content.Context;
-import android.net.http.HttpEngine;
 import android.os.Build;
 
 import androidx.test.core.app.ApplicationProvider;