[jdk11u-dev] RFR: 8186143: keytool -ext option doesn't accept wildcards for DNS subject alternative names

[Goetz Lindenmaier]

I backport this for parity with 11.0.17-oracle.
Clean except for Copyright. Will mark /clean.

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Commit messages:
 - Backport 0c9f8e472f1d452e97b3cbd50b9e5d700fffcd15

Changes: https://git.openjdk.org/jdk11u-dev/pull/1257/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1257&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8186143
  Stats: 109 lines in 3 files changed: 96 ins; 0 del; 13 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1257.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1257/head:pull/1257

PR: https://git.openjdk.org/jdk11u-dev/pull/1257