prefer ipv4

Former-commit-id: faf2c93c

roles/prefer_ipv4/files/gai.conf

+#from https://community.rackspace.com/products/f/public-cloud-forum/5110/how-to-prefer-ipv4-over-ipv6-in-ubuntu-and-centos
+label       ::1/128        0
+label       ::/0           1
+label       2002::/16      2
+label       ::/96          3
+label       ::ffff:0:0/96  4
+precedence  ::1/128        50
+precedence  ::/0           40
+precedence  2002::/16      30
+precedence  ::/96          20
+precedence  ::ffff:0:0/96  100
+

roles/prefer_ipv4/tasks/main.yml

+- name: Copy over gai.conf to /etc/
+  become: true
+  become_user: root
+  copy: 
+   src:   gai.conf
+   dest:  /etc/gai.conf
+   owner: root
+   group: root
+   mode:  0644
+