Bug#27737195: NO ERROR FOR --CACHING_SHA2_PASSWORD_PRIVATE_KEY_PATH=INVALID-FILE

Description: Converted message about server not being able
             to read key files from INFORMATION to WARNING.

Author: harinvadodaria

mysql-test/include/mtr_warnings.sql

@@ -1,4 +1,4 @@
--- Copyright (c) 2008, 2017, Oracle and/or its affiliates. All rights reserved.
+-- Copyright (c) 2008, 2018, Oracle and/or its affiliates. All rights reserved.
 --
 -- This program is free software; you can redistribute it and/or modify
 -- it under the terms of the GNU General Public License as published by
@@ -292,6 +292,11 @@ INSERT INTO global_suppressions VALUES
  ("Member with address .* is reachable again."),
  ("The member has resumed contact with a majority of the members in the group.*"),
  ("Members removed from the group.*"),
+ /*
+   Missing Private/Public key files
+ */
+ ("RSA private key file not found"),
+ ("RSA public key file not found"),
 
  ("THE_LAST_SUPPRESSION")||
 

sql/auth/sql_authentication.cc

@@ -189,9 +189,9 @@ Rsa_authentication_keys::read_key_file(RSA **key_ptr,
   */
   if ((key_file= fopen(key_file_path.c_ptr(), "r")) == NULL)
   {
-    sql_print_information("RSA %s key file not found: %s."
-                          " Some authentication plugins will not work.",
-                          key_type, key_file_path.c_ptr());
+    sql_print_warning("RSA %s key file not found: %s."
+                      " Some authentication plugins will not work.",
+                      key_type, key_file_path.c_ptr());
   }
   else
   {