[MGM] Support nova_net_id option when there are n+ Neutron networks

Change-Id: I99b6b9b8ff386ca77ce24e23ff1fa07b96546472

doc/pool_mgm/config.rst

@@ -78,6 +78,10 @@ Command Line Options
 
       The image ID or name to use on new nodes spun up in the Nova API
 
+   .. option:: --nova_net_id <Neutron Network ID>
+
+      Specify which Neutron Network ID workers should be started with.
+
    .. option:: --nova_image_size <NOVA_IMAGE_SIZE>
 
       The flavor ID (image size ID) or name to use for new nodes spun up in

libra/mgm/mgm.py

@@ -114,6 +114,10 @@ def main():
         '--nova_bypass_url',
         help='use a different URL to the one supplied by the service'
     )
+    options.parser.add_argument(
+        '--nova_net_id',
+        help="The ID of the network to put loadbalancer on"
+             "(Required if multiple Neutron networks)")
     options.parser.add_argument(
         '--gearman', action='append', metavar='HOST:PORT', default=[],
         help='Gearman job servers'

libra/mgm/nova.py

@@ -52,6 +52,7 @@ class Node(object):
         self.secgroup = args.nova_secgroup
         self.node_basename = args.node_basename
         self.az = args.nova_az_name
+        self.net_id = args.nova_net_id
         self.rm_fip_ignore_500 = args.rm_fip_ignore_500
 
         # Replace '_' with '-' in basename
@@ -144,6 +145,11 @@ class Node(object):
             node_name = '{0}-{1}'.format(self.node_basename, node_id)
         else:
             node_name = '{0}'.format(node_id)
+
+        networks = []
+        if self.net_id:
+            networks.append({"uuid": self.net_id})
+
         body = {"server": {
                 "name": node_name,
                 "imageRef": self.image,
@@ -152,7 +158,7 @@ class Node(object):
                 "max_count": 1,
                 "min_count": 1,
                 "availability_zone": self.az,
-                "networks": [],
+                "networks": networks,
                 "security_groups": [{"name": self.secgroup}]
                 }}
         resp, body = self.nova.post(url, body=body)