Revert 1c884fa4e5a847549afa45350e37b0362c50feae which introduced the following bug: Instead of allowing to dump the `ansible-playbook` command details when VAGRANT_LOG=debug was defined, it was then impossible to disable this console output when VAGRANT_LOG was undefined (in such case, ``@logger.debug? systematically returns `true`) In order to keep things simple and focused, it is preferable to drop the bad idea to mix Ansible verbosity and Vagrant log level. Fix #5803
Vagrant Core Plugins
These are plugins that ship with Vagrant. Vagrant core uses its own plugin system to power a lot of the core pieces that ship with Vagrant. Each plugin will have its own README which explains its specific role.