Fix user/org creation on Vagrant+CS12 and improve Pedant behavior

On Vagrant we depend on the `virtual_hosts` config to statically define the /etc/hosts file on each VM.  That's a bummer because in AWS we point `api.mydomain` at localhost, which improves the reliability of Pedant tests and also ensures knife-opc commands go to backend1 when backend1 is the bootstrap node.

Also, now that chef-metal grabs chef 12 by default, we get SSL errors from the stricter `ssl_verify_mode` setting, addressed by https://github.com/patrick-wright/ec-tools/pull/1

fixes #122