Added doc and fixes - bridge support

AUTHORS.md

@@ -22,6 +22,7 @@ Christer Edwards [christer.edwards@gmail.com]
 - Petru T. Garstea
 - Sven R.
 - Tobias Tom
+- Stefano Marinelli
 
 ### Special thanks
 Software doesn't happen in a vacuum. Thank you to the following people who may

docs/chapters/networking.rst

@@ -109,6 +109,18 @@ To define a default route / gateway for all VNET containers define the value in
 This config change will apply the defined gateway to any new containers.
 Existing containers will need to be manually updated.
 
+Virtual Network (VNET) on External Bridge
+--------------------------------------
+To create a VNET based container and attach it to an external, already existing bridge, use the `-B` option, an IP/netmask and
+external bridge.
+
+.. code-block:: shell
+
+  bastille create -B azkaban 12.1-RELEASE 192.168.1.50/24 bridge0
+
+Bastille will automagically create the interface, attach it to the specified bridge and connect /
+disconnect containers as they are started and stopped. 
+The bridge needs to be created/enabled before creating and starting the jail.
 
 Public Network
 ==============

usr/local/share/bastille/create.sh

@@ -43,7 +43,7 @@ usage() {
     -L | --linux  -- This option is intended for testing with Linux jails, this is considered experimental.
     -T | --thick  -- Creates a thick container, they consume more space as they are self contained and independent.
     -V | --vnet   -- Enables VNET, VNET containers are attached to a virtual bridge interface for connectivity.
-    -B | --bridge   -- Enables VNET, VNET containers are attached to a specified, already existing local bridge.
+    -B | --bridge -- Enables VNET, VNET containers are attached to a specified, already existing external bridge.
 
 EOF
     exit 1