anchor.diff:  
   . Smoke test the maven/ant dance that we use to get vagrant involved in
   integration testing is working:
  +
   ---------------------------------------------
   mvn -Dtests.vagrant -Psmoke-vms -pl qa/vagrant verify
   ---------------------------------------------
  +
   or this to validate all the VMs:
  +
   -------------------------------------------------
   mvn -Dtests.vagrant=all -Psmoke-vms -pl qa/vagrant verify
   -------------------------------------------------
  +
   That will start up the VMs and then immediate quit.
   
   . Finally run the tests. The fastest way to get this started is to run:
  +
   -----------------------------------
   mvn clean install -DskipTests
   mvn -Dtests.vagrant -pl qa/vagrant verify
   -----------------------------------
  +
   You could just run:
  +
   --------------------
   mvn -Dtests.vagrant verify
   --------------------
  +
   but that will run all the tests. Which is probably a good thing, but not always
   what you want.
   
  
positive.code: 
  We're missing the following from the support matrix because there aren't high
  quality boxes available in vagrant atlas:
  * sles-11
  * sles-12
  * opensuse-13
  * oel-6
  
  We're missing the follow because our tests are very linux/bash centric:
  * Windows Server 2012
  
  Its important to think of VMs like cattle: if they become lame you just shoot
  them and let vagrant reprovision them. Say you've hosed your precise VM:
  ----------------------------------------------------
  vagrant ssh precise -c 'sudo rm -rf /bin'; echo oops
  ----------------------------------------------------
  All you've got to do to get another one is
  ----------------------------------------------
  vagrant destroy -f trusty && vagrant up trusty
  ----------------------------------------------
  The whole process takes a minute and a half on a modern laptop, two and a half
  without vagrant-cachier.
  
  
negative.code: ----------------------------------------------------
  
  If you wanted to retest all the release artifacts on a single VM you could:
  
  -------------------------------------------------
  # Build all the distributions fresh but skip recompiling elasticsearch:
  mvn -amd -pl distribution install -DskipTests
  