fix full qualified table name schema introspection
Merge pull request #462 from deeky666/respect-sqlserver-schemaname

Fix full qualified table name schema introspection
add support for renaming indexes
introduce platform for MySQL 5.7 with index renaming support
Merge pull request #473 from deeky666/DBAL-234

[DBAL-234] [DBAL-566] Add support for renaming indexes