Allow virtual jenkins host

[giuliana-bezerra]

A host parameter for jenkins class would be handful for people using virtual hosts. A way of providing a private IP rather than using "http://localhost" would support a Vagrant approach to create jenkins host.

[jhoblitt]

Values in the service config file can be overridden with the config_hash param. Something like this should work:

  class { 'jenkins':
    config_hash => {
      'JENKINS_LISTEN_ADDRESS' => { 'value' => '1.2.3.4' },
    }
  }