Add a test for the missing case.
Allow (immediately) circular fkey references in CREATE TABLE and DROP.
Another missing test.
Check for cross-schema FK reference in DROP SCHEMA.
Leave out associated FKs in low-level drop; caller should have checked legality.
merge MMcM: Some unhandled cases in foreign keys

Merge pull request #1150 from MMcM/sql-layer/more-foreign-keys-1
https://github.com/FoundationDB/sql-layer/pull/1150