RFR: 8240997: Remove more "hack" word in security codes

[Jack Hartstein]

This change is part of a larger  code cleanup effort and removes the term "hack" out of several files in the jdk.
JBS: [](https://bugs.openjdk.java.net/browse/JDK-8240997 )

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Commit messages:
 - 8240997: Remove more hack word in security codes

Changes: https://git.openjdk.java.net/jdk/pull/4148/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4148&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8240997
  Stats: 8 lines in 4 files changed: 0 ins; 0 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4148.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4148/head:pull/4148

PR: https://git.openjdk.java.net/jdk/pull/4148