RFR: 8273617: UninitializedDisplayModeChangeTest.java times out on macOS 12 [v2]

[Prasanta Sadhukhan]

> 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.

Prasanta Sadhukhan has updated the pull request incrementally with one additional commit since the last revision:

  Remove thread blocking

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5647/files
  - new: https://git.openjdk.java.net/jdk/pull/5647/files/512ef797..cd32d096

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5647&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5647&range=00-01

  Stats: 4 lines in 2 files changed: 0 ins; 1 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5647.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5647/head:pull/5647

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