Merge branch 'vlans' into 'master'

VLAN networking support

this should add VLAN networking setup.
from DOCs..
```
bond0.10:
  network.managed:
    - type: vlan
    - ipaddr: 10.1.0.4
    - use:
      - network: bond0
    - require:
      - network: bond0
```

See merge request !9

README.rst

             - interface: ${linux:interface:eth0}
             - interface: ${linux:interface:eth0}
 
+Linux with vlan interface_params
+
+.. code-block:: yaml
+
+    linux:
+      network:
+        enabled: true
+        interface:
+          vlan69:
+            type: vlan
+            use_interfaces:
+            - interface: ${linux:interface:bond0}
+
 Linux with wireless interface parameters
 
 .. code-block:: yaml
       network:
         enabled: true
         gateway: 10.0.0.1
-        default_interface: eth0 
+        default_interface: eth0
         interface:
           wlan0:
             type: eth
       network:
         enabled: true
         gateway: 10.0.0.1
-        default_interface: eth0 
+        default_interface: eth0
         interface:
           eth0:
             type: eth

linux/network/interface.sls

     - network: linux_interface_{{ network }}
     {%- endfor %}
   {%- endif %}
+  {%- if interface.type == 'vlan' %}
+  - use:
+    {%- for network in interface.use_interfaces %}
+    - network: {{ network }}
+    {%- endfor %}
+  - require:
+    {%- for network in interface.use_interfaces %}
+    - network: {{ network }}
+    {%- endfor %}
+  {%- endif %}
 
 {%- if interface.gateway is defined %}