Rework tests check all wheels produced against a reference list

Also, wrap the cibuildwheel call to make building env easier

test/07_ssl/cibuildwheel_test.py

@@ -1,5 +1,4 @@
-import subprocess, sys, os
-from glob import glob
+import os
 import utils
 
 def test():
@@ -7,10 +6,4 @@ def test():
     # this test checks that SSL is working in the build environment using
     # some checks in setup.py.
 
-    # build the wheels
-    subprocess.check_call([sys.executable, '-m', 'cibuildwheel', project_dir])
-    
-    # check that we got the right number of built wheels
-    expected_identifiers = utils.cibuildwheel_get_build_identifiers(project_dir)
-    built_wheels = glob('wheelhouse/*.whl')
-    assert len(built_wheels) == len(expected_identifiers)
+    utils.cibuildwheel_run(project_dir)