RFR: JDK-8291974 PrivateCredentialPermission should not use local variable to enable debugging [v2]

[Mark Powers]

> https://bugs.openjdk.org/browse/JDK-8291974

Mark Powers has updated the pull request incrementally with one additional commit since the last revision:

  added test

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/10206/files
  - new: https://git.openjdk.org/jdk/pull/10206/files/04fda021..a8e304d1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10206&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10206&range=00-01

  Stats: 76 lines in 1 file changed: 76 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/10206.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10206/head:pull/10206

PR: https://git.openjdk.org/jdk/pull/10206