Connectivity from workers to gearmand on zuul.

* manifests/site.pp: Pass both jenkins.openstack.org and
jenkins-dev.openstack.org to openstack_project::zuul as the list of
gearman workers for use in iptables rules.

* modules/openstack_project/manifests/jenkins.pp
* modules/openstack_project/manifests/jenkins_dev.pp: Remove unused
4155/tcp from public allowed ports list, previously for a bzr
service which is no longer running on these servers.

* modules/openstack_project/manifests/zuul.pp: Add iptables rules
allowing access from gearman workers to the gearmand, and also
configure gearmand to listen on all addresses including IPv6, as
opposed to its IPv4-only default.

* install_modules.sh: Add puppetlabs-stdlib version 3.2.0 to the list of
puppet dependencies. This is required to pull in the "flatten" function
used in zuul.pp above.

Change-Id: I05d4abc92b3050884a7e9f3c2b6cd9dcc81bfa36
Reviewed-on: https://review.openstack.org/26245
Reviewed-by: James E. Blair <corvus@inaugust.com>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Approved: Jeremy Stanley <fungi@yuggoth.org>
Tested-by: Jenkins