Lee Hinman c67a9663af
Fix MasterServiceTests.testClusterStateUpdateLogging (#38116)
This changes the test to not use a `CountDownlatch`, instead adding an assertion
for the final logging message and waiting until the `MockAppender` has seen it
before proceeding.

Related to df2c06f6f30f7e23a6863a3f72fc3bdb7648885c
Resolves #23739
2019-01-31 17:13:19 -07:00
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