RFR: JDK-8263155: Allow additional contents for DMG

[Andy Herrick]

JDK-8263155: Allow additional contents for DMG

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Commit messages:
 - JDK-8263155: Allow additional contents for DMG
 - JDK-8263155: Allow additional contents for DMG
 - JDK-8263155: Allow additional contents for DMG

Changes: https://git.openjdk.java.net/jdk/pull/5912/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5912&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8263155
  Stats: 169 lines in 8 files changed: 153 ins; 0 del; 16 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5912.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5912/head:pull/5912

PR: https://git.openjdk.java.net/jdk/pull/5912