MDEV-15851 Stop creating mysql.host table

Changed bootstrap scripts, adjusted result files.

mysql-test/include/mtr_check.sql

@@ -85,7 +85,6 @@ BEGIN
     mysql.help_category,
     mysql.help_keyword,
     mysql.help_relation,
-    mysql.host,
     mysql.plugin,
     mysql.proc,
     mysql.procs_priv,

mysql-test/include/system_db_struct.inc

@@ -5,7 +5,6 @@
 -- replace_result Tables_in_mysql Tables_in_db Tables_in_test Tables_in_db
 show tables;
 show create table db;
-show create table host;
 show create table user;
 show create table func;
 show create table tables_priv;