made test case compatible to older requets lib
diff --git a/src/emuvim/test/unittests/test_sonata_dummy_gatekeeper.py b/src/emuvim/test/unittests/test_sonata_dummy_gatekeeper.py
index 02991cd..375087d 100755
--- a/src/emuvim/test/unittests/test_sonata_dummy_gatekeeper.py
+++ b/src/emuvim/test/unittests/test_sonata_dummy_gatekeeper.py
@@ -1,6 +1,6 @@
 import time
 import requests
-import subprocess
+import json
 import os
 import unittest
 from emuvim.test.base import SimpleTestTopology
@@ -33,10 +33,10 @@
         files = {"package": open(PACKAGE_PATH, "rb")}
         r = requests.post("http://127.0.0.1:5000/packages", files=files)
         self.assertEqual(r.status_code, 200)
-        self.assertTrue(r.json().get("service_uuid") is not None)
+        self.assertTrue(json.loads(r.text).get("service_uuid") is not None)
 
         # instantiate service
-        service_uuid = r.json().get("service_uuid")
+        service_uuid = json.loads(r.text).get("service_uuid")
         r2 = requests.post("http://127.0.0.1:5000/instantiations", json={"service_uuid": service_uuid})
         self.assertEqual(r2.status_code, 200)
 
@@ -45,9 +45,9 @@
 
         # check get request APIs
         r3 = requests.get("http://127.0.0.1:5000/packages")
-        self.assertEqual(len(r3.json().get("service_uuid_list")), 1)
+        self.assertEqual(len(json.loads(r3.text).get("service_uuid_list")), 1)
         r4 = requests.get("http://127.0.0.1:5000/instantiations")
-        self.assertEqual(len(r4.json().get("service_instance_list")), 1)
+        self.assertEqual(len(json.loads(r4.text).get("service_instance_list")), 1)
 
         # check number of running nodes
         self.assertTrue(len(self.getContainernetContainers()) == 3)
diff --git a/utils/docker/Dockerfile b/utils/docker/Dockerfile
index 18e8bfe..27157d8 100755
--- a/utils/docker/Dockerfile
+++ b/utils/docker/Dockerfile
@@ -11,6 +11,8 @@
     && cd /son-emu \
     # we need to reset the __pycache__ for correct test discovery
     && rm -rf src/emuvim/test/__pycache__ \
+    && rm -rf src/emuvim/test/unittests/__pycache__ \
+    && rm -rf src/emuvim/test/integrationtests/__pycache__ \
     && python setup.py install \
     && echo 'Done'