[jdk11u-dev] RFR: 8279066: entries.remove(entry) is useless in PKCS12KeyStore

[Goetz Lindenmaier]

I backport this for parity with 11.0.18-oracle.

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Commit messages:
 - Backport fb623f1d2ee858fbc6edfeaaa702b5fcd832a0aa

Changes: https://git.openjdk.org/jdk11u-dev/pull/1359/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1359&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8279066
  Stats: 5 lines in 1 file changed: 0 ins; 5 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1359.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1359/head:pull/1359

PR: https://git.openjdk.org/jdk11u-dev/pull/1359