Bug#29805 mysql_upgrade test fail if ~/.my.cnf contain a password

- "mysql" and "mysqlcheck" should not read defaults file


client/mysql_upgrade.c:
  Instruct "mysql" and "mysqlcheck" that is invoked by "mysql_upgrade" not
  to read defaults file, they should get all the parameters they need from
  mysql_upgrade(that read the default file)

client/mysql_upgrade.c

@@ -455,6 +455,7 @@ static int run_query(const char *query, DYNAMIC_STRING *ds_res,
 
   ret= run_tool(mysql_path,
                 ds_res,
+                "--no-defaults",
                 ds_args.str,
                 "--database=mysql",
                 "--batch", /* Turns off pager etc. */
@@ -617,6 +618,7 @@ static int run_mysqlcheck_upgrade(void)
   verbose("Running 'mysqlcheck'...");
   return run_tool(mysqlcheck_path,
                   NULL, /* Send output from mysqlcheck directly to screen */
+                  "--no-defaults",
                   ds_args.str,
                   "--check-upgrade",
                   "--all-databases",