RFR: 8166026: refactor shell tests to java

[Ivan Šipka]

@iignatev  could you please review? Thank you.

note to self:
jtreg test/jdk/java/lang/ProcessBuilder/InheritIO/InheritIoTest.java test/jdk/java/lang/SecurityManager/modules/CustomSecurityManagerTest.java test/jdk/java/lang/Thread/uncaughtexceptions/UncaughtExceptionsTest.java test/jdk/java/lang/annotation/loaderLeak/LoaderLeakTest.java

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Commit messages:
 - 8166026: removing tab character
 - 8166026: refactor shell tests to java

Changes: https://git.openjdk.java.net/jdk/pull/1484/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1484&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8166026
  Stats: 1002 lines in 12 files changed: 496 ins; 505 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1484.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1484/head:pull/1484

PR: https://git.openjdk.java.net/jdk/pull/1484