RFR: 8240349: jlink --vm with not present VM does not fail fast

[Athijegannathan Sundararajan]

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

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Commit messages:
 - 8240349: jlink --vm with not present VM does not fail fast

Changes: https://git.openjdk.java.net/jdk/pull/4386/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4386&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8240349
  Stats: 56 lines in 2 files changed: 56 ins; 0 del; 0 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