RFR: 8166026: Refactor java/lang shell tests to java

[Ivan Šipka]

Refactor `test/jdk/java/lang/Thread/UncaughtExceptions.sh` as java test.

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Commit messages:
 - 8166026: Refactor java/lang shell tests to java

Changes: https://git.openjdk.java.net/jdk/pull/1578/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1578&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8166026
  Stats: 411 lines in 2 files changed: 206 ins; 205 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1578.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1578/head:pull/1578

PR: https://git.openjdk.java.net/jdk/pull/1578