ignore dev-hosts
add sudoers #includedir back
use sudoers.d to add wheel access
use an unqualified path to python2
deploy to dev hosts by default
Merge djmitche/buildbot-infra:init-ansible (PR #5)
add some secrets

The vault password is `sekrit`, and it only has a placeholder in it.  We
will re-key to a shared password before adding real secrets.