Ones should be able to see in information_schema.tables if a table is encrypted

Currently information_schema.tables does not contain encryption options in some cases.

This is needed to ensure that logical tools like mysqldump + mysqlimport will create the new tables encrypted if the original was encrypted.
(Unfortunately the mysqldump output will not be encrypted, but this is a separate issue).

Having the encryption option in information_schema.tables will also make it easier to quickly check which tables are encrypted and which are not.

Currently one will get the encryption option in CREATE_OPTIONS in the case of:
CREATE TABLE t1 (a int) engine=innodb encryption=yes;

However in the following case it will not be shown:
SET GLOBAL innodb_encrypt_tables = ON;
CREATE TABLE t1 (a int) engine=innodb;

Suggested fix:

• Add `encrypted`=yes last to CREATE_OPTIONS for encrypted tables if the option is not already there.