Add extension settings in jjb

Enable passing extra settings to jjb,
so settings needed for extra modules can be
easily set on jenkins_jobs.ini

Extensions must be sent with the format
$extensions = [
  {
    'name'       => 'extension',
    'parameters' => [
      {
        'name'  => 'parameter_name',
        'value' => 'parameter_value',
      }
    ]
  }
]
Enable passing hipchat_authtoken parameter to
enable HipChat integration on jjb.

Change-Id: I7317eda0ad245e3320577d194e545eb4edaf3fac

manifests/job_builder.pp

@@ -8,7 +8,9 @@ class jenkins::job_builder (
   $git_url = 'https://git.openstack.org/openstack-infra/jenkins-job-builder',
   $config_dir = '',
   $jenkins_jobs_update_timeout = '600',
+  $extensions = [],
 ) {
+  validate_array($extensions)
 
   # A lot of things need yaml, be conservative requiring this package to avoid
   # conflicts with other modules.

templates/jenkins_jobs.ini.erb

@@ -2,3 +2,10 @@
 user=<%= @username %>
 password=<%= @password %>
 url=<%= @url %>
+
+<% @extensions.each do |extension| -%>
+["<%= extension['name'] %>"]
+<% @extension['parameters'].each do |parameter| -%>
+<%= parameter['name'] %> = <%= parameter['value'] %>
+<% end -%>
+<% end -%>