vlib: add description field in plugin registration

Change-Id: I88b322a5d602f3d6d3310e971479180a89430e0e
Signed-off-by: Damjan Marion <damarion@cisco.com>
diff --git a/src/examples/sample-plugin/sample/sample.c b/src/examples/sample-plugin/sample/sample.c
index 0185274..2f8ac4c 100644
--- a/src/examples/sample-plugin/sample/sample.c
+++ b/src/examples/sample-plugin/sample/sample.c
@@ -61,6 +61,7 @@
 /* *INDENT-OFF* */
 VLIB_PLUGIN_REGISTER () = {
     .version = SAMPLE_PLUGIN_BUILD_VER,
+    .description = "Sample of VPP Plugin",
 };
 /* *INDENT-ON* */