Fix test failures under Windows
Fixed a few test failures which would occur on Windows due to SQLite file
locking issues, as well as some timing issues in connection pool related
tests; pull request courtesy Federico Caselli.
Note the pool related issues were fixed by Mike in
I1a7162e67912d22c135fa517b687a073f8fd9151 but are being ticketed
here.
Fixes: #4946
Closes: #5055
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/5055
Pull-request-sha:
36925573aff828bbdd725a4fed5394e06c775a98
Change-Id: Ic53ec82f5d588d0e26a2d033a17c6109900d7f63
(cherry picked from commit
f461d710f9f848029603cf76f7c26725afdea11e)