MASTER_GTID_WAIT timeout on the master

Hi,

MASTER_GTID_WAIT work as documented when executed on a slave,

But if it get trigger on the master it timeout !

• That's wrong because last gtid is from the master and so should exist
• This defeat any naive strategy to load balance read on the master as well .
• This defeat strategy to use same code on a production master-slave with single database deployment for dev

Thanks