Extract and publish p4runtime protocol utils in separate artifact

For consumption by third-party apps built via mvn

Change-Id: Ic9c1eccb2519b2952cdb632e1f07ccefbba00396
diff --git a/protocols/p4runtime/utils/BUILD b/protocols/p4runtime/utils/BUILD
new file mode 100644
index 0000000..a521bbb
--- /dev/null
+++ b/protocols/p4runtime/utils/BUILD
@@ -0,0 +1,8 @@
+COMPILE_DEPS = CORE_DEPS + [
+    "//protocols/p4runtime/proto:onos-protocols-p4runtime-proto",
+    "//deps:com_google_protobuf_protobuf_java",
+]
+
+osgi_jar_with_tests(
+    deps = COMPILE_DEPS,
+)