Fix "wrap functions with 2 blank lines" pep8 check

Now gates are requires this pep8 rule as mandatory so until it'll be
fixed merge is blocked

Change-Id: Ic34859a0397a770db0a5203491f035cb81461bce

tools/generate_driver_list.py

@@ -136,5 +136,6 @@ def main():
     finally:
         os.chdir(cur_dir)
 
+
 if __name__ == '__main__':
     main()

tools/install_venv.py

@@ -69,5 +69,6 @@ def main(argv):
     install.install_dependencies()
     print_help()
 
+
 if __name__ == '__main__':
     main(sys.argv)