Relax volume compare in test_minimum_basic_scenario

Similar to I50d1319b690453923b470733e94f3a11fd1cd249 for
the server that was just created, this change relaxes the
volume compare check on the updated_at field since we can
race between the time the volume was created and when comparing
to the results of GETing the volume that updated_at could have
changed.

Change-Id: Ie666b9ea0e46cf3ee22d07709e5faebafde35325
Closes-Bug: #1838202
1 file changed