Basic test fixing

The python which slapos used to run runTestSuite and the python which
installed by SlapOS is not identical...

nogil_test/basic_test.py

 import subprocess
 import importlib
-import json
+import build_extension
 
 def run(env, python_path):
-  # Build the extension when installing the Cython in slapos
-  # subprocess.call([python_path, 'nogil_extension.py', 'build_ext', '--inplace'], env=env)
-  source = ''
+  source = subprocess.check_output([python_path + " -c 'import nogil_extension; a = nogil_extension.bag(); print(a)'"],
+          env=env,
+          shell=True,
+          )
   failure_count = 0
-  try:
-      nogil_extension = importlib.import_module('nogil_extension')
-  except ImportError as e:
-      source = str(e)
-      failure_count = 1
-  else:
-      source = nogil_extension.bag()
-      if source != '4.0\n42.0':
-          failure_count = 1
+  if source != b'4.0\n42.0\n':
+    failure_count = 1
   
-  result_dict = {'failed':failure_count, 'stdout':source}
+  result_dict = {'failed': failure_count, 'stdout': source}
   return result_dict
-  # print(json.dumps(result_dict))