Add role to build Puppet module

This patch adds an Ansible role which can be used to build Puppet
modules.

Change-Id: I45761c2d111640733ddec8b4c08066655b6944e2

roles/build-puppet-module/README.rst

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+An ansible role to build a Puppet module.  This role assumes that Puppet is
+already installed on the target system (either manually or using bindep).
+
+**Role Variables**
+
+.. zuul:rolevar:: puppet_module_chdir
+   :default: {{ zuul.project.src_dir }}
+
+   The folder to switch into in order to build the Puppet module

roles/build-puppet-module/defaults/main.yaml

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+puppet_module_chdir: "{{ zuul.project.src_dir }}"

roles/build-puppet-module/tasks/main.yaml

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+- name: Build puppet module
+  command: puppet module build .
+  args:
+    chdir: "{{ puppet_module_chdir }}"