* Fix for 'ansible-vault encrypt' with vault_password_file in config and --ask-vault-pass cli (https://github.com/ansible/ansible/pull/30514#pullrequestreview-63395903)
* updated porting guide with notes for callbacks and config
* Added backwards compatiblity shim for callbacks that do not inherit from CallbackBase
* Corrected issue with configuration and multiple ini entries being overwriten even when not set.