[jdk11u-dev] RFR: 8215571: jdb does not include jdk.* in the default class filter

[Goetz Lindenmaier]

I backport this for parity with 11.0.18-oracle.

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Commit messages:
 - Backport 203f6ad99ab580297c039d5d8c903a25a0991948

Changes: https://git.openjdk.org/jdk11u-dev/pull/1393/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1393&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8215571
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1393.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1393/head:pull/1393

PR: https://git.openjdk.org/jdk11u-dev/pull/1393