Fix key selection "Test insert into statements with values on web visit data model" so that test doesn't damage key allocator.

https://github.com/Starcounter/Starcounter/issues/2409
Merge branch 'develop' of github.com:Starcounter/Starcounter into feature/PopulateIndexMetadata2028
Deleting meta-data about index on index drop. Part of #2028.