fix Live-sanity check for BlobStoreExpiryTest

This doesn't make sense to me. We do `Assert.fail()` on line 152, which is guaranteed to throw an `AssertionError`, then we catch it and log that we expected it.

I thought the intent of the catch-block was that the `assertContainerFound` should throw an exception (not a failing assertion) because the token had expired.

When I run it, I see the log message `failed, as expected: java.lang.AssertionError: should fail as long as class org.jclouds.openstack.handlers.RetryOnRenew is not working`, so the suggestion it "failed, as expected" isn't correct.