Fixing patch-yang-lib utility to also patch the YANG BUCK plugin.

Change-Id: Ic23f263ef3df34ff8bfbe1823f09d0b5ee1f8415
diff --git a/tools/dev/bin/patch-yang-libs b/tools/dev/bin/patch-yang-libs
index f4d6f03..be082d5 100755
--- a/tools/dev/bin/patch-yang-libs
+++ b/tools/dev/bin/patch-yang-libs
@@ -40,3 +40,7 @@
 
 EOF
 done
+
+# Patch the YANG BUCK plugin
+cp $YANG_TOOLS_ROOT/compiler/plugin/buck/target/onos-yang-compiler-buck-plugin-$SVER.jar \
+        $ONOS_ROOT/bin/plugins/yang.jar