Adjusts reclaim instance interval of deferred delete tests

All deferred delete tests set reclaim_instance_interval to 1. This is
fine for the test_deferred_delete test that depends on the periodic
task _reclaim_queued_deletes to run.

For the other tests however, in the unlikely event that the periodic
task do run before the tests are done, it will interfere with the tests
by terminating the instance in the middle of it.

By setting the interval longer than the actual test run, this can be
avoided.

Resolves bug 1146510.

Change-Id: I606cd9f3277cc86cf4f9811da2a10efc7433b9d0
Merge "Adjusts reclaim instance interval of deferred delete tests"
Switch to oslo.config.

The oslo-config package has been renamed. Switch to the new
version. (should fix SmokeStack).

Change-Id: I6a0fa803b0076bc5338c996e21bbcef54e1d75cd
Merge "Switch to oslo.config."