Update CHANGELOG for 11850

[jackkleeman]

#11850

[spzala]

lgtm Thanks!

[spzala]

@jackkleeman can you please update your commit title to something like "CHANGELOG: update for 11850" ?, to pass the build error - expected commit title format <package>{", "<package>}: <description>

[spzala]

Thanks for addressing the comment!
Found following test failure, which is not related to changes, but need to keep an eye /cc @mitake
=== RUN TestGetTokenWithoutAuth

{"level":"warn","ts":"2020-05-14T18:42:47.000Z","caller":"clientv3/retry_interceptor.go:62","msg":"retrying of unary invoker failed","target":"endpoint://client-3cc59e0e-6b6a-4c33-9f4b-fd2e274cea3f/localhost:40063135770121164210","attempt":0,"error":"rpc error: code = DeadlineExceeded desc = context deadline exceeded"}

TestGetTokenWithoutAuth: user_test.go:147: not expected result:context deadline exceeded with endpoint:[unix://localhost:40063135770121164210]

--- FAIL: TestGetTokenWithoutAuth (10.49s)