Use dropAndCreateDatabase schema manager function in test initialization instead of individual versions of each.

[DDC-1657] Prevent autoincrement sequences from creating DROP SEQUENCE statements because of old/new schema missmatch.

The AbstractSchemaManager expects getting the regex with its
delimiters since 8beb732f but the tests were not updated.

[DBAL-166] Default MySQL to UTF8/utf8_general_ci. Allow to set default table options from SchemaConfig.

[DBAL-237] Fix bug when removing and adding an index on the same columns that may be part of a foreign key.

DDC-451 - GUID support through a specific GUID Type, SQL Server specific implementation all others fallback to Varchar fields, no automatic default value = new guid support yet.