* Remove all code related to VALID_PRIVS and get_valid_privs()
* Add tests to update user with invalid privs
* Re-raise InvalidPrivsError when granting privileges
* Fix: compatibility with python2
* More explicit assertions as commented by Andersson007
* Add changelog fragment
* mysql_user: replace VALID_PRIVS by get_valid_privs() function
* Add EXTRA_PRIVS in case we need to add more privs in the future
* Add changelog fragment