event logger skeletons, improve debug CLI

Change-Id: Ieb2e4043fc7bc3b4a5436a7a6aa35f573d8d4506
Signed-off-by: Dave Barach <dave@barachs.net>
diff --git a/vppinfra/vppinfra/elog.h b/vppinfra/vppinfra/elog.h
index db84c95..afa6773 100644
--- a/vppinfra/vppinfra/elog.h
+++ b/vppinfra/vppinfra/elog.h
@@ -408,6 +408,7 @@
 void unserialize_elog_main (serialize_main_t * m, va_list * va);
 
 void elog_init (elog_main_t * em, u32 n_events);
+void elog_alloc (elog_main_t * em, u32 n_events);
 
 #ifdef CLIB_UNIX
 always_inline clib_error_t *