In our test environments, it's good to be able to roll back to the same, anonymous, snapshot repeatedly. This patch adds a `--no-delete` option to the `snapshot pop` command allowing this. This makes the new core snapshot behaviour more consistent with what we were doing with vagrant-multiprovider-snap (https://github.com/scalefactory/vagrant-multiprovider-snap)
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.