spanner.it.ITDatabaseTest: databaseDeletedTest failed

[flaky-bot]

Note: #2079 was also for this test, but it was closed more than 10 days ago. So, I didn't mark it flaky.

---

commit: 2d95234
buildURL: Build Status, Sponge
status: failed

Test output

expected not to be: null
	at com.google.cloud.spanner.it.ITDatabaseTest.databaseDeletedTest(ITDatabaseTest.java:110)

[flaky-bot]

Test passed for commit 34b6dfe (Build Status, Sponge)! Closing this issue.