Updated openstack/openstack
Project: openstack/sahara  fc4bd317336540a6cf12a37de88e3a0cc50fdaf3

Use in-memory sqlite DB for unit tests

Currently unit tests use temporary file for DB. This causes
several problems:
1. temp files need to be cleared even after crash
2. temp folder need to be properly configures in OS
3. temp folder could be modified in code (e.g.
   oslotest.base.BaseTestCase)

Using in-memory DB fixes all these problems.

Partly implements: blueprint oslotest

Change-Id: I8be76efdb2fa56f5e8865dcafbc3c240a6be0f64