smartos: use Google DNS servers

DNS tests are sensible to which DNS servers are used. Google DNS servers
are known to work and should provide a stable DNS environment to run the
tests.

Fixes: nodejs/node-v0.x-archive#25858

setup/smartos/ansible-playbook.yaml

@@ -20,6 +20,15 @@
       with_items: packages
       tags: general
 
+    - name: Remove all DNS servers from resolv.conf
+      lineinfile: dest=/etc/resolv.conf state=absent regexp="^(\s*)nameserver(\s+)"
+      tags: general
+
+    - name: Add DNS servers to the list in resolv.conf
+      lineinfile: dest=/etc/resolv.conf state=present regexp="^(\s*)nameserver(\s+){{ item }}(\s*)$" line="nameserver {{ item }}"
+      with_items: dns_servers
+      tags: general
+
     - name: User | Add {{ server_user }} group
       command: groupadd {{ server_user }}
       tags: user

setup/smartos/ansible-vars.yaml

@@ -18,3 +18,6 @@ packages:
   - automake
   - libtool
   - ccache
+dns_servers:
+  - 8.8.8.8
+  - 8.8.4.4