Move the pythonpath fiddling to the test runner

instead of including it in every test

test/02_test/cibuildwheel_test.py

@@ -1,11 +1,9 @@
 import subprocess, sys, os
 from glob import glob
-project_dir = os.path.dirname(__file__)
-sys.path.append(os.path.join(os.path.dirname(project_dir), 'shared'))
-
 import utils
 
 def test():
+    project_dir = os.path.dirname(__file__)
     # set up the environment
     env = os.environ.copy()
     env['CIBW_TEST_REQUIRES'] = 'nose'