Expands cleanup action to handle dev VMs
Expands cleanup action to handle dev VMs

More comprehensive "make clean" behavior, including removal of:

  * Vagrant VMs
  * Molecule VMs
  * temporary git repos cloned by Molecule (for upgrade testing)
  * git-clean even gitignored directories

The output is fairly verbose, so it's obvious to the developer what's
been changed in the environment.

heartsucker/securedrop,heartsucker/securedrop,ehartsuyker/securedrop,heartsucker/securedrop,ehartsuyker/securedrop,conorsch/securedrop,heartsucker/securedrop,ehartsuyker/securedrop,ehartsuyker/securedrop,conorsch/securedrop,conorsch/securedrop,conorsch/securedrop,ehartsuyker/securedrop,heartsucker/securedrop,conorsch/securedrop,ehartsuyker/securedrop