RFR: 8281104: jar --create should create missing parent directories

[Christian Stein]

Calling `jar --create --file a/b/foo.jar INPUT-FILES` should create missing parent directories (here `a/b`) on the default file system before storing the JAR file (here `foo.jar`) in the destination directory.

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Commit messages:
 - Expect at least jar file's name in error message
 - Use provided error writer
 - Use LF as line separator
 - 8281104: Add happy-path and expected-to-fail tests
 - 8281104: jar --create should create missing parent directories

Changes: https://git.openjdk.java.net/jdk/pull/7327/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7327&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281104
  Stats: 124 lines in 2 files changed: 119 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7327.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7327/head:pull/7327

PR: https://git.openjdk.java.net/jdk/pull/7327