RFR: 8292676: Remove two kerberos tests from problem list

[Weijun Wang]

The two tests are no longer manual and should be removed from the problem list.

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Commit messages:
 - the fix

Changes: https://git.openjdk.org/jdk/pull/9943/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9943&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8292676
  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/9943.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9943/head:pull/9943

PR: https://git.openjdk.org/jdk/pull/9943