Set resolv.conf on nodes before bootstrap

In some clouds, the nodes created may not have a usable
dns server from Neutron.
Use the Google one, may set this role parameterized at
some point.

Change-Id: I05fcd867e47fcc45dab25d5be5c8349d272514f4

roles/set_resolv_conf/defaults/main.yml

@@ -0,0 +1,4 @@
+---
+dns_nameservers:
+  - 8.8.8.8
+  - 8.8.4.4

roles/set_resolv_conf/tasks/main.yml

@@ -0,0 +1 @@
+- template: src=resolv.conf.j2 dest=/etc/resolv.conf

roles/set_resolv_conf/templates/resolv.conf.j2

@@ -0,0 +1,3 @@
+{% for s in dns_nameservers %}
+nameserver {{ s }}
+{% endfor %}

set_resolv_conf.yml

@@ -0,0 +1,8 @@
+---
+# file: set_resolv_conf.yml
+- hosts: infra
+  gather_facts: no
+  user: ubuntu
+  become: true
+  roles:
+    - { role: set_resolv_conf }

site.yml

@@ -2,6 +2,7 @@
 # file: site.yml
 - include: generate_infra_dynamic_groups.yml
 - include: wait_for_servers.yml
+- include: set_resolv_conf.yml
 - include: common.yml
 - include: set_hostnames.yml
 - include: bootstrap_puppetmaster.yml