[jdk13u-dev] Integrated: 8223940: Private key not supported by chosen signature algorithm

[Yuri Nesterenko]

applicable to 13u as well and should be downported. Patch applies clean at this moment; all relevant regtests do pass.

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Commit messages:
 - Backport b7f557e5c7a934f5d962748e7162e131fcc336ad

Changes: https://git.openjdk.java.net/jdk13u-dev/pull/36/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk13u-dev&pr=36&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8223940
  Stats: 126 lines in 4 files changed: 49 ins; 24 del; 53 mod
  Patch: https://git.openjdk.java.net/jdk13u-dev/pull/36.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk13u-dev pull/36/head:pull/36

PR: https://git.openjdk.java.net/jdk13u-dev/pull/36