<AWT Dev> RFR: 8266949: Check possibility to disable OperationTimedOut on Unix

[Sergey Bylokhov]

Our implementation of realSync on Unix is not straightforward, we try to move the awt root window and catch the ConfigureNotify. The problem is that the request to move the awt root window can be ignored, and it is possible that the notification will not come. In this case, we throw non-specified OperationTimedOut and it crashes the random tests here and there.

I have applied the same logic as on Windows and Linux we will wait till timeout(10 seconds) and then exit from the realsync.

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Commit messages:
 - Update ProblemList.txt
 - Initial fix

Changes: https://git.openjdk.java.net/jdk/pull/4038/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4038&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8266949
  Stats: 34 lines in 2 files changed: 11 ins; 17 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4038.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4038/head:pull/4038

PR: https://git.openjdk.java.net/jdk/pull/4038