RFR: 8335344: test/jdk/sun/security/tools/keytool/NssTest.java fails to compile

[Fernando Guallini]

There is a compilation issue in the test **test/jdk/sun/security/tools/keytool/NssTest.java** because the [HumanInputStream](https://github.com/openjdk/jdk/blob/master/test/jdk/java/security/testlibrary/HumanInputStream.java) class was moved from keytool/KeyToolTest.java to a library class in this [PR](https://github.com/openjdk/jdk/pull/19790) for reusability. NssTest is coupled with KeyToolTest.java, therefore it will also need to import HumanInputStream from the test library.

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Commit messages:
 - add testlibrary to avoid compilation issue

Changes: https://git.openjdk.org/jdk/pull/19946/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19946&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8335344
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/19946.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19946/head:pull/19946

PR: https://git.openjdk.org/jdk/pull/19946