RFR: JDK-8293412 Remove unnecessary java.security.egd overrides

[Mark Powers]

https://bugs.openjdk.org/browse/JDK-8293412

-------------

Commit messages:
 - Merge
 - second iteration
 - Merge
 - first iteration

Changes: https://git.openjdk.org/jdk/pull/10716/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10716&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293412
  Stats: 31 lines in 10 files changed: 2 ins; 17 del; 12 mod
  Patch: https://git.openjdk.org/jdk/pull/10716.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10716/head:pull/10716

PR: https://git.openjdk.org/jdk/pull/10716