Merge branch 'interfaces' into 'newinfra'

[interfaces] Configure fluxx interfaces

See merge request !83

host_vars/fluxx.adm.crans.org.yml

+---
+interfaces:
+  adm: eth0

plays/network-interfaces.yml

 #!/usr/bin/env ansible-playbook
 ---
-- hosts: voyager.adm.crans.org,boeing.adm.crans.org
+- hosts: voyager.adm.crans.org,boeing.adm.crans.org,fluxx.adm.crans.org
   vars:
     vlan:
       - name: srv