Fixes for build env VMs and playbook

changed the build deb pkgs playbook to use the development-specific.yml var file instead of staging.

updated the virtualbox names of the /build$/ VMs.

*** Changes to Vagrantfile warning ***
You will want run `vagrant destroy /build$/ -f` prior to merging this change or will get vagrant errors later.
Merge pull request #701 from dolanjs/build-env-fix

Fixes for build env VMs and playbook