[ONOS-7035] Packet Protobuf model

Change-Id: I188fe329335e26095cc0b4fde5c6cded6fb87de4
diff --git a/incubator/protobuf/models/src/main/proto/net/packet/OutboundPacketProto.proto b/incubator/protobuf/models/src/main/proto/net/packet/OutboundPacketProto.proto
new file mode 100644
index 0000000..00e0bb9
--- /dev/null
+++ b/incubator/protobuf/models/src/main/proto/net/packet/OutboundPacketProto.proto
@@ -0,0 +1,13 @@
+syntax = "proto3";
+option java_package = "org.onosproject.grpc.net.packet.models";
+
+package net.packet;
+
+import "net/flow/TrafficTreatmentProto.proto";
+
+// Corresponds to org.onosproject.net.packet.OutboundPacket.
+message OutboundPacketProto {
+    string device_id = 1;
+    net.flow.TrafficTreatmentProto treatment = 2;
+    bytes data = 3;
+}
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