Vagrant-tramp lists boxes after their deletion

[jmercouris]

When creating and deleting vagrant boxes in different locations on the system, they are not always created and deleted from the list when you press c-x c-f vagrant: + tab

this can be due to the Tramp file in ~/.emacs.d/Tramp

[ryanprior]

We can come up with an eviction scheme for cached connections using tramp-cache. The docker-tramp method offers a docker-tramp-cleanup command which we could emulate.

Perhaps we could even try for something more automatic, but given how long vagrant commands take to run, it might add noticeable overhead time unless it's done asynchronously.