Updated openstack/openstack
Project: openstack-infra/devstack-gate  31f56bbdbc1930b0fe9df7c41e56c4a806081a6b

Updates to README.rst

Remove specific references to Python versions, update Debugging
Failure section including link to elastic-recheck docs, and
details for simulating tests.

Change-Id: I66ad638a0f1968ff00d4ca5340a053ecc8a134b6