RFR: 8282007: Assorted enhancements to jpackage testing framework [v2]

[Alexey Semenyuk]

> 8282007: Assorted enhancements to jpackage testing framework

Alexey Semenyuk has updated the pull request incrementally with one additional commit since the last revision:

  Don't fail if requested to uninstall not installed Debian package

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7502/files
  - new: https://git.openjdk.java.net/jdk/pull/7502/files/895997ac..8ce156d9

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7502&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7502&range=00-01

  Stats: 4 lines in 1 file changed: 3 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7502.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7502/head:pull/7502

PR: https://git.openjdk.java.net/jdk/pull/7502