wrap main code path in its own function

This lets us use it as a console_scripts entry point.

Signed-off-by: Nils Philippsen <nils@redhat.com>

pagure-sync-bugzilla.py

@@ -522,7 +522,7 @@ def notify_users(errors):
 
 
 @cache.cache_on_arguments()
-def _get_override_yaml(project):
+def _get_override_yaml(project, session):
     pagure_override_url = '{0}/{1}/raw/master/f/{2}/{3}'.format(
         PAGUREURL.rstrip('/'), BUGZILLA_OVERRIDE_REPO, project['namespace'],
         project['name'])
@@ -631,7 +631,7 @@ def _to_legacy_schema(product_and_project, session=None):
         owner = 'orphan'
 
     # Check if the Bugzilla ticket assignee has been manually overridden
-    override_yaml = _get_override_yaml(project)
+    override_yaml = _get_override_yaml(project, session)
     if override_yaml.get(product) \
             and isinstance(override_yaml[product], str):
         owner = override_yaml[product]
@@ -655,7 +655,10 @@ def _to_legacy_schema(product_and_project, session=None):
     }
 
 
-if __name__ == '__main__':
+def main():
+    """The entrypoint to the script."""
+    global VERBOSE, DRYRUN, projects_dict
+
     parser = argparse.ArgumentParser(
         description='Script syncing information between Pagure and bugzilla'
     )
@@ -817,3 +820,7 @@ if __name__ == '__main__':
             json.dump({}, stream)
 
     sys.exit(0)
+
+
+if __name__ == '__main__':
+    main()