RFR: 8276084: Linux DEB Bundler: release number in outputted .deb file should be optional

[Alexey Semenyuk]

8276084: Linux DEB Bundler: release number in outputted .deb file should be optional

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Commit messages:
 - Bugfix
 - Bugfix
 - Bugfix
 - 8276084: Linux DEB Bundler: release number in outputted .deb file should be optional

Changes: https://git.openjdk.java.net/jdk/pull/6345/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6345&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8276084
  Stats: 65 lines in 7 files changed: 52 ins; 1 del; 12 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6345.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6345/head:pull/6345

PR: https://git.openjdk.java.net/jdk/pull/6345