RFR: 8253747: tools/jpackage/share/AppImagePackageTest.java fails with InstalledPackageSize: 0

[Andy Herrick]

8253747: tools/jpackage/share/AppImagePackageTest.java fails with InstalledPackageSize: 0
Updated Debian code in test to get package size in BK, allowing for non-zero size less than 1KB

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Commit messages:
 - JDK-8253747: tools/jpackage/share/AppImagePackageTest.java fails with InstalledPackageSize: 0
 - JDK-8253747: tools/jpackage/AppImagePackageTest.java fails

Changes: https://git.openjdk.java.net/jdk/pull/404/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=404&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8253747
  Stats: 10 lines in 1 file changed: 9 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/404.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/404/head:pull/404

PR: https://git.openjdk.java.net/jdk/pull/404