migrate code over from xos repo

Change-Id: I764ac3196babdb1ce78dded2b2d8d6ad6e965ca6
diff --git a/xos/synchronizer/model_policies/model_policy_Network.py b/xos/synchronizer/model_policies/model_policy_Network.py
new file mode 100644
index 0000000..06347c5
--- /dev/null
+++ b/xos/synchronizer/model_policies/model_policy_Network.py
@@ -0,0 +1,41 @@
+from core.models import *
+
+def handle(network):
+	from core.models import ControllerSlice,ControllerNetwork, Network
+	from collections import defaultdict
+
+        print "MODEL POLICY: network", network
+
+        # network = Network.get(network_id)
+	# network controllers are not visible to users. We must ensure
+	# networks are deployed at all deploymets available to their slices.
+	slice_controllers = ControllerSlice.objects.all()
+	slice_deploy_lookup = defaultdict(list)
+	for slice_controller in slice_controllers:
+		slice_deploy_lookup[slice_controller.slice].append(slice_controller.controller)
+
+	network_controllers = ControllerNetwork.objects.all()
+	network_deploy_lookup = defaultdict(list)
+	for network_controller in network_controllers:
+		network_deploy_lookup[network_controller.network].append(network_controller.controller)
+
+	expected_controllers = slice_deploy_lookup[network.owner]
+	for expected_controller in expected_controllers:
+		if network not in network_deploy_lookup or \
+		  expected_controller not in network_deploy_lookup[network]:
+                        lazy_blocked=True
+
+                        # check and see if some instance already exists
+                        for networkslice in network.networkslices.all():
+                            if networkslice.slice.instances.filter(node__site_deployment__controller=expected_controller).exists():
+                               print "MODEL_POLICY: network, setting lazy_blocked to false because instance on controller already exists"
+                               lazy_blocked=False
+
+			nd = ControllerNetwork(network=network, controller=expected_controller, lazy_blocked=lazy_blocked)
+                        print "MODEL POLICY: network", network, "create ControllerNetwork", nd, "lazy_blocked", lazy_blocked
+                        if network.subnet:
+                            # XXX: Possibly unpredictable behavior if there is
+                            # more than one ControllerNetwork and the subnet
+                            # is specified.
+                            nd.subnet = network.subnet
+			nd.save()