b2d9abe344
Prior to this commit, if a created but exited container bound a port, and a new container grabed that same port (say for an ssh port forward), when the initial container came back up it would fail because the port also got bound to the second container. This commit fixes that behavior by first looking at what containers are already bound prior to creating a container.
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.