Hi Sachin!
I'll review the patch. If Monty wants to chip in he can do so.
1. Indentation is wrong for the patch, you have an extra step of indentation.
2. I would use only one return true statement, after the if/else statement.
3. For singular subject sentence use does instead of do. So:
'Flashback does not support %s'. Same for the error message 'MariaDB Galera does not support binlog format: %s'
4. A testcase would be really useful for this.
Vicențiu