RFR: 8273617: UninitializedDisplayModeChangeTest.java times out on macOS 12

[Prasanta Sadhukhan]

On Thu, 23 Sep 2021 06:47:33 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

> java/awt/FullScreen/UninitializedDisplayModeChangeTest/UninitializedDisplayModeChangeTest.java is timing out every time on macOS 12 even though the test passed.
> Looks like the the main process waits for child process created in the test forever, making it timeout after jtreg timeout of 2min.
> Modified to wait for childprocess for 30secs.

Since CGCompleteDisplayConfiguration hangs if we ask the thread to wait, remove thread blocking allows the test to run on all CI macos version.

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PR: https://git.openjdk.java.net/jdk/pull/5647