RFR: 8240349: jlink should not leave partial image output directory on failure [v2]

[Athijegannathan Sundararajan]

> jlink should clean up output directory on any failure. should not leave partially filled output.

Athijegannathan Sundararajan has updated the pull request incrementally with one additional commit since the last revision:

  Fixed resouce closing issue for lib/moduls file. Pre-existing output directory should not be deleted when exiting.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4386/files
  - new: https://git.openjdk.java.net/jdk/pull/4386/files/f12e6a29..df036a3a

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4386&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4386&range=00-01

  Stats: 48 lines in 5 files changed: 22 ins; 12 del; 14 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4386.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4386/head:pull/4386

PR: https://git.openjdk.java.net/jdk/pull/4386