RFR: 8305421: Work around JDK-8305420 in CDSJDITest.java

[Ioi Lam]

Please review this trivial work-around that removes logging that would trigger [JDK-8305420](https://bugs.openjdk.org/browse/JDK-8305420).

I also fixed an incorrect parameter in the `executeAndLog()` call, which caused the dumping process's stdout/stderr to be logged in the wrong file.

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Commit messages:
 - 8305421: Work around JDK-8305420 in CDSJDITest.java

Changes: https://git.openjdk.org/jdk/pull/13283/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13283&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8305421
  Stats: 3 lines in 1 file changed: 0 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/13283.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13283/head:pull/13283

PR: https://git.openjdk.org/jdk/pull/13283