Revoke grants issue in mysql provider version 1.5.0. Bad syntax

[ghost]

This issue was originally opened by @julio-id90 as hashicorp/terraform#20050. It was migrated here as a result of the provider split. The original body of the issue is below.

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Hi people.
I've found an issue with the mysql provider version 1.5.0 which when trying to revoke grants misses the * after the database schema name:

mysql_grant.grant_new_subnet: error revoking GRANT (REVOKE GRANT OPTION ON `DB_NAME`. FROM 'user'@'172.16.1.0/255.255.255.0'): Error 1064: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'FROM 'user'@'172.16.1.0/255.255.255.0'' at line 1

It worked just fine with mysql provider's version 1.1.0

$ terraform -v
Terraform v0.11.9

Thanks!