Extend percona_show_temp_tables_stress to handle TokuDB
Percona Server has INFORMATION_SCHEMA.GLOBAL_TEMPORARY_TABLES features to query the list of all temp tables in all sessions. The implementation of this feature involves cloning open temp table handlers, thus running SE-specific code.
There is a testcase main.percona_show_temp_tables_stress where one thread queries GLOBAL_TEMP_TABLES in a loop while parallel connection creates and drops temp tables with different engines. This test should be extended to handle TokuDB too, either by some conditional logic inside the testcase, or creating a separate one and moving common parts to an include file etc.