TST: test_transactions for sqlite fallback fails on python 3.6

[jorisvandenbossche]

Skipped on travis for now: 880de30

See also comment here: #14679 (comment) (I can reproduce it locally by running the test, but not with a simple example mimicking the test)

[shreyateeza]

@jorisvandenbossche @jreback Can you please let me know how can I resolve this issue?

[jorisvandenbossche]

First step would be to try to reproduce the issue. If you run the test locally, does it fail? (when removing the skip)