[jdk17u-dev] RFR: 8255548: Missing coverage for javax.xml.crypto.dom.DOMCryptoContext

[Martin Doerr]

Backport of [JDK-8255548](https://bugs.openjdk.org/browse/JDK-8255548).

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Commit messages:
 - Backport 76cda9f44a80b1979e6e1b7a21431ef631f80782

Changes: https://git.openjdk.org/jdk17u-dev/pull/1649/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1649&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8255548
  Stats: 46 lines in 1 file changed: 45 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1649.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1649/head:pull/1649

PR: https://git.openjdk.org/jdk17u-dev/pull/1649