fix bazel_integration_test runner to allow non-release URLs

was broken by cd5416e in such a way that it was testing the prior release and not the local code from HEAD

tools/bazel_integration_test/test_runner.py

@@ -24,10 +24,12 @@ def modify_WORKSPACE(wksp, distro_path):
  content = wksp_file.read()
  # Replace the url for rules_python with our locally built one
  content = re.sub(
- r'url = "https://github.com/bazelbuild/rules_python/releases/download/[^"]+"',
+ r'url = "https://github.com/bazelbuild/rules_python/[^"]+"',
  'url = "file://%s"' % r.Rlocation(distro_path),
  content)
+ # comment out sha256 and strip_prefix if present
  content = re.sub(r'sha256 = "', '#\1', content)
+ content = re.sub(r'strip_prefix = "', '#\1', content)
  with open(wksp, 'w') as wksp_file:
  wksp_file.write(content)