[ONOS-6707] Host Protobuf model

Change-Id: Id036c13a92ac629465eddfc7c695c55086c3d5c0
diff --git a/incubator/protobuf/models/src/main/proto/net/host/HostEventProto.proto b/incubator/protobuf/models/src/main/proto/net/host/HostEventProto.proto
new file mode 100644
index 0000000..5a538dc
--- /dev/null
+++ b/incubator/protobuf/models/src/main/proto/net/host/HostEventProto.proto
@@ -0,0 +1,14 @@
+syntax = "proto3";
+option java_package = "org.onosproject.grpc.net.host.models";
+
+package net.host;
+
+import "net/HostProto.proto";
+import "net/host/HostEnumsProto.proto";
+
+
+// Corresponds to org.onosproject.net.device.HostEvent.
+message HostNotificationProto {
+    net.HostProto host = 1;
+    net.host.HostEventTypeProto hostEventType = 2;
+}
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