Merge pull request #7909 from nextcloud/fix-migration-type-hints

apps/dav/lib/Migration/Version1004Date20170825134824.php

apps/dav/lib/Migration/Version1004Date20170919104507.php

apps/dav/lib/Migration/Version1004Date20170924124212.php

apps/dav/lib/Migration/Version1004Date20170926103422.php

...ckupcodes/lib/Migration/Version1002Date20170607104347.php

...ckupcodes/lib/Migration/Version1002Date20170607113030.php

...ckupcodes/lib/Migration/Version1002Date20170919123342.php

...ckupcodes/lib/Migration/Version1002Date20170926101419.php

core/Command/Db/Migrations/GenerateCommand.php

core/Command/Db/Migrations/GenerateFromSchemaFileCommand.php

core/Migrations/Version13000Date20170705121758.php

core/Migrations/Version13000Date20170718121200.php

core/Migrations/Version13000Date20170814074715.php

core/Migrations/Version13000Date20170919121250.php

core/Migrations/Version13000Date20170926101637.php

lib/composer/composer/autoload_classmap.php

lib/composer/composer/autoload_static.php

lib/private/DB/MigrationService.php

lib/private/DB/SchemaWrapper.php

lib/public/DB/ISchemaWrapper.php