Add isEnabled to interface and add tests
diff --git a/java_gen/templates/custom/interface/OFPortDesc.java b/java_gen/templates/custom/interface/OFPortDesc.java
new file mode 100644
index 0000000..ecf39f3
--- /dev/null
+++ b/java_gen/templates/custom/interface/OFPortDesc.java
@@ -0,0 +1,2 @@
+    // Additional method
+    boolean isEnabled();
\ No newline at end of file