Refactoring file structure for protobufs.

Change-Id: I50daf100d54750f97158304d87813e67861b1422
diff --git a/incubator/protobuf/models/src/main/proto/DeviceProto.proto b/incubator/protobuf/models/src/main/proto/DeviceProto.proto
new file mode 100644
index 0000000..f4a81d1
--- /dev/null
+++ b/incubator/protobuf/models/src/main/proto/DeviceProto.proto
@@ -0,0 +1,18 @@
+syntax = "proto3";
+option java_package = "org.onosproject.grpc.net.models";
+
+package Device;
+
+import "DeviceEnums.proto";
+
+// Corresponds to org.onosproject.net.Device.
+message DeviceProto {
+    string deviceId = 1;
+    Device.DeviceType type = 2;
+    string manufacturer = 3;
+    string hw_version = 4;
+    string sw_version = 5;
+    string serial_number = 6;
+    string chassis_id = 7;
+    map<string, string> annotations = 8;
+}