MDEV-5943 'show table status' does not immediately show tokudb tables

MDEV-5839 TokuDB tables not properly cleaned on DROP DATABASE

TokuDB does not support discover_table_names() and writes no files
in the database directory, so automatic filename-based
discover_table_names() doesn't work either. So, it must force .frm
file to disk in ::create()

sql/table.h

@@ -979,6 +979,9 @@ struct TABLE_SHARE
   */
   bool write_frm_image(const uchar *frm_image, size_t frm_length);
 
+  bool write_frm_image(void)
+  { return frm_image ? write_frm_image(frm_image->str, frm_image->length) : 0; }
+
   /*
     returns an frm image for this table.
     the memory is allocated and must be freed later

storage/tokudb/ha_tokudb.cc

@@ -6861,6 +6861,12 @@ int ha_tokudb::create(const char *name, TABLE * form, HA_CREATE_INFO * create_in
     THD* thd = ha_thd();
     memset(&kc_info, 0, sizeof(kc_info));
 
+    // TokuDB does not support discover_table_names() and writes no files
+    // in the database directory, so automatic filename-based
+    // discover_table_names() doesn't work either. So, it must force .frm
+    // file to disk.
+    form->s->write_frm_image();
+
     trx = (tokudb_trx_data *) thd_data_get(ha_thd(), tokudb_hton->slot);
 
     const srv_row_format_t row_type= (srv_row_format_t)form->s->option_struct->row_format;

storage/tokudb/mysql-test/tokudb_alter_table/r/row_format_alter.result

@@ -5,6 +5,7 @@ CREATE TABLE foo (c1 int not null primary key) engine=TokuDB;
 SELECT CREATE_OPTIONS 
 FROM INFORMATION_SCHEMA.TABLES  WHERE (table_name LIKE 'foo');
 CREATE_OPTIONS
+`compression`='tokudb_zlib'
 SHOW CREATE TABLE foo;
 Table	Create Table
 foo	CREATE TABLE `foo` (

storage/tokudb/mysql-test/tokudb_mariadb/r/discover_names.result

+create table t1 (id int primary key) engine=tokudb;
+show tables;
+Tables_in_test
+t1
+drop table t1;
+create database mysqltest1;
+use mysqltest1;
+create table t1 (a int) engine=tokudb;
+drop database mysqltest1;
+create database mysqltest1;
+use mysqltest1;
+create table t1 (a int) engine=tokudb;
+drop database mysqltest1;

storage/tokudb/mysql-test/tokudb_mariadb/t/discover_names.test

+#
+# MDEV-5943 'show table status' does not immediately show tokudb tables
+#
+create table t1 (id int primary key) engine=tokudb;
+show tables;
+drop table t1;
+
+#
+# MDEV-5839 TokuDB tables not properly cleaned on DROP DATABASE
+#
+create database mysqltest1;
+use mysqltest1;
+create table t1 (a int) engine=tokudb;
+drop database mysqltest1;
+
+create database mysqltest1;
+use mysqltest1;
+create table t1 (a int) engine=tokudb;
+drop database mysqltest1;
+