[jdk11u-dev] RFR: 8180569: Refactor sun/security/krb5/ shell tests to plain java tests

[Christoph Langer]

Backport of JDK-8180569 Refactor sun/security/krb5/ shell tests to plain java tests

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Commit messages:
 - Backport 8b83b515b1981557ab27703482b4c14ca4cdb11c

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/386/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=386&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8180569
  Stats: 486 lines in 9 files changed: 146 ins; 327 del; 13 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/386.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/386/head:pull/386

PR: https://git.openjdk.java.net/jdk11u-dev/pull/386