[jdk11u-dev] RFR: 8209546: Make sun/security/tools/keytool/autotest.sh to support macosx

[Goetz Lindenmaier]

I backport this for parity with 11.0.20-oracle.

I resolved the imports in PKCS11TEst.java. Some were already there, the other could not be deleted.

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Commit messages:
 - Backport afe05800acd115aa707ddd3b08d5b8a79810df20

Changes: https://git.openjdk.org/jdk11u-dev/pull/1839/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1839&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8209546
  Stats: 316 lines in 5 files changed: 89 ins; 216 del; 11 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1839.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/1839/head:pull/1839

PR: https://git.openjdk.org/jdk11u-dev/pull/1839