anchor.diff:  https://github.com/mitchellh/vagrant/issues/4479
   
   Some vagrant commands will work on all VMs at once:
  +
   ------------------
   vagrant halt
   vagrant destroy -f
   ------------------
   
  +
   ----------
   vagrant up
   ----------
  +
   would normally start all the VMs but we've prevented that because that'd
   consume a ton of ram.
   
  
positive.code: In general its best to stick to testing in vagrant because the bats scripts are
  destructive. When working with a single package its generally faster to run its
  tests in a tighter loop than maven provides. In one window:
  --------------------------------
  mvn -pl distribution/rpm package
  --------------------------------
  and in another window:
  ----------------------------------------------------
  vagrant up centos-7 && vagrant ssh centos-7
  cd $RPM
  
negative.code: 
  . (Optional) Install vagrant-cachier to squeeze a bit more performance out of
  the process:
  
  --------------------------------------
  vagrant plugin install vagrant-cachier
  --------------------------------------
  
  . Validate your installed dependencies:
  
  -------------------------------------
  mvn -Dtests.vagrant -pl qa/vagrant validate
  -------------------------------------
  