Marko Mäkelä 4ebaf81360 MDEV-19455: Avoid SET DEBUG_DBUG='-d,...' construct ...

Apply the correct pattern for debug instrumentation:

SET @save_dbug=@@debug_dbug;
SET debug_dbug='+d,...';
...
SET debug_dbug=@save_dbug;

Numerous tests use statements of the form

SET debug_dbug='-d,...';

which will inadvertently enable all DBUG tracing output,
causing unnecessary waste of resources.

2019-10-11 14:02:35 +03:00

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