Update and run isort (#9573)

I want to use isort as part of https://github.com/certbot/certbot/issues/9572 because I want to do it programmatically, however, I felt like the config needed to be tweaked a bit due to it not understanding what is and is not our own code.

This PR updates the isort config so it recognizes our own modules and runs `isort .` from the root of the repo to update everything.

* update isort config

* run "isort ."

letstest/scripts/version.py

@@ -5,7 +5,10 @@ Provides a simple utility for determining the Certbot version number
 
 """
 from __future__ import print_function
-from os.path import abspath, dirname, join
+
+from os.path import abspath
+from os.path import dirname
+from os.path import join
 import re