Add in-message cli_request/cli_reply API

This new CLI API is meant to replace the
cli_request/cli_reply that uses shared memory.

PS: checkstyle -- *hate*

Change-Id: I6318f8f6b9be2c2398b49dac9e2193c1998ea724
Signed-off-by: Ole Troan <ot@cisco.com>
diff --git a/vpp-api-test/vat/vat.h b/vpp-api-test/vat/vat.h
index 311b9c7..ce8b166 100644
--- a/vpp-api-test/vat/vat.h
+++ b/vpp-api-test/vat/vat.h
@@ -166,6 +166,7 @@
   volatile i32 retval;
   volatile u32 sw_if_index;
   volatile u8 *shmem_result;
+  volatile u8 *cmd_reply;
 
   /* our client index */
   u32 my_client_index;