enable check same thread for aiosqlite
enable check same thread for aiosqlite

to do this we have to invent our own isolation level
setter based on their current internals.   however
now we can ensure thread-safe access.  we are trying
to resolve an issue where test suite on CI seems to fail
around the same time each time.

Change-Id: I79c8fc04b9afef0876fb446ad40a7621a772cd34

zzzeek/sqlalchemy,sqlalchemy/sqlalchemy