[jdk11u-dev] RFR: 8286969: Add a new test library API to execute kinit in SecurityTools.java

[Andrew Lu]

I backport this for parity with 11.0.23-oracle.

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Commit messages:
 - Backport dbda0e2bda5d8ba86f068684941a05387947d993

Changes: https://git.openjdk.org/jdk11u-dev/pull/2458/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2458&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8286969
  Stats: 12 lines in 1 file changed: 12 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2458.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2458/head:pull/2458

PR: https://git.openjdk.org/jdk11u-dev/pull/2458