Bug#56528 Increased server footprint with MTR

With recent changes in the performance schema default sizing parameters,
the memory used by a mysqld binary increased accordingly.

This negatively affects the MTR test suite,
because running several tests in parallel now consumes more ressources.

The fix is to leave the default production values unchanged,
and to configure the MTR environment to limit memory
used when running tests in the test suite, which is ok
because only a few objects are typically used within a test script.

This fix:
- changed the default configuration in MTR to use less memory
- adjusted the performance schema tests accordingly

Note that 1,000 mutex instances was too short and caused test failures
in the past in team trees, so the default used is now 10,000 in MTR.

The amount of memory used by the performance schema itself
can be observed with the statement SHOW ENGINE PERFORMANCE_SCHEMA STATUS

mysql-test/suite/perfschema/r/start_server_no_thread_class.result

@@ -45,11 +45,11 @@ performance_schema_max_file_classes	50
 performance_schema_max_file_handles	32768
 performance_schema_max_file_instances	10000
 performance_schema_max_mutex_classes	200
-performance_schema_max_mutex_instances	1000000
+performance_schema_max_mutex_instances	10000
 performance_schema_max_rwlock_classes	30
-performance_schema_max_rwlock_instances	1000000
-performance_schema_max_table_handles	100000
-performance_schema_max_table_instances	50000
+performance_schema_max_rwlock_instances	10000
+performance_schema_max_table_handles	1000
+performance_schema_max_table_instances	500
 performance_schema_max_thread_classes	0
 performance_schema_max_thread_instances	1000
 show engine PERFORMANCE_SCHEMA status;