- Improve logging when an error occurs in a signing subprocess by including stdout in the log
- Update tegrasign to create the python2 wrapper scripts only if the script has a she-bang line that ends with 'python' or 'python2'. Since python2 is no longer available in some distros, a user that needs to run the server on a recent version of, say, Ubuntu, can update the couple of python2 scripts to python3 instead.