New implementation of network interfaces

Combine interfaces and network_ether_interfaces into one common
variable network_interfaces. Provisioning uses format:

network_interfaces:
  - device: device name eg. vio0 or eth0
    vlan: vlan id for this interface
    mac: mac address for interface (optional)

Additionally network role will use more settings to configure
interface.

host_vars/ldap01.home.foo.sh.yml

@@ -1,6 +1,9 @@
 ---
-interfaces: [[20, "52:54:00:ac:dc:1f"]]
 vmhost: vmhost01.home.foo.sh
+network_interfaces:
+  - device: eth0
+    vlan: 20
+    mac: 52:54:00:ac:dc:1f
 datadisks:
   - 10