[jdk11u-dev] RFR: 8245665: Test WeakAlg.java should only make sure no warning for weak signature algorithms by keytool on root CA

[Goetz Lindenmaier]

I downport this for parity with 11.0.13-oracle.

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Commit messages:
 - Backport ccd7d70586e05a06420f30af78746603a424c85e

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/409/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=409&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8245665
  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/409.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/409/head:pull/409

PR: https://git.openjdk.java.net/jdk11u-dev/pull/409