Update Buildroot to 2019.02.3 (#415)

* Update Buildroot to 2019-02.3

* Fix enter script

* Update ova_defconfig

* Fix network manager

* Remove runc patches

* Use same docker version

* Fix build

* Fix vmtools

* Fix depens

* Fix handling with tempfiles

* Fix permission handling

* Fix cp

* Cleanup

* Fix mounts

buildroot/support/testing/tests/package/sample_python_treq.py

@@ -0,0 +1,16 @@
+from twisted.internet import reactor
+import treq
+
+
+def done(response):
+    print(response.code)
+    reactor.stop()
+
+
+def err(fail):
+    print(fail.value)
+    reactor.stop()
+
+
+treq.get("https://localhost").addCallback(done).addErrback(err)
+reactor.run()