testGetArray test is flaky

[ajkannan]

Travis very recently has started to complain that the "deadline is exceeded" and fails when running DatastoreTests.testGetArray() in some runs.

[ajkannan]

The test doesn't seem to be flaky now. The issue (a timeout to connect to localhost when running DatastoreTest.java unit tests on Travis) was observed for a brief time window last week. I will reopen if seen again.