RFR: JDK-6725221 Standardize obtaining boolean properties with defaults

[Mark Powers]

JDK-6725221 Standardize obtaining boolean properties with defaults

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Commit messages:
 - Merge
 - first iteration

Changes: https://git.openjdk.java.net/jdk/pull/8559/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8559&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-6725221
  Stats: 27 lines in 10 files changed: 1 ins; 4 del; 22 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8559.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8559/head:pull/8559

PR: https://git.openjdk.java.net/jdk/pull/8559