add play for configuring nine.bb.net
add play for configuring nine.bb.net

* ensure worker account exists
* create a virtual environment for the build master
* install and configure build master
  * Buildbot -- branch 'master'
  * metabbotcfg -- branch 'nine'
* create supervisor service for the build master (buildmaster)
* install and configure nginx

buildbot/buildbot-infra,ewongbb/buildbot-infra,djmitche/buildbot-infra,seankelly/buildbot-infra,ewongbb/buildbot-infra,seankelly/buildbot-infra,djmitche/buildbot-infra,buildbot/buildbot-infra,seankelly/buildbot-infra,djmitche/buildbot-infra,buildbot/buildbot-infra