API message table inspection utilities

Add doxygen tags for show/clear commands

Change-Id: Ic939c561b15b0b720a8db1ecacc17e3d74419e1d
Signed-off-by: Dave Barach <dave@barachs.net>
diff --git a/src/vlibapi/api_common.h b/src/vlibapi/api_common.h
index bbeccfc..dc6761b 100644
--- a/src/vlibapi/api_common.h
+++ b/src/vlibapi/api_common.h
@@ -255,6 +255,9 @@
   /* Replay in progress? */
   int replay_in_progress;
 
+  /* Dump (msg-name, crc) snapshot here at startup */
+  u8 *save_msg_table_filename;
+
   /* List of API client reaper functions */
   _vl_msg_api_function_list_elt_t *reaper_function_registrations;