replace - in a secret name to _
create a special group of slave passwords
add supervisor roles

supervisor

* add supervisor package
* config it
* enable and start supervisor daemon
* the role has a parameter -- services -- a list of supervisor services
  to be created: see roles/supervisor/templates/service.conf.j2 for
  parameter list (probably should go to a overall doc of sort)

supervisor-service

* to be documented
add virtualenv role
add bb-master role

* see documentation role in roles/bb-master/README.rst
add user role

this roles allows to create a non-priviledged user

after creating a user, `getent` module is used to get its GECOS record
so, for example, user's home directory is available for following
roles/tasks.
add more params to proxy config
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
Merge pull request #25 from sa2ajj/configure-nine

Configure nine.bb.net