RFR: 8321703: jdeps generates illegal dot file containing nodesep=0,500000

[Mandy Chung]

Trivial fix.  Call `PrintWriter::format` with null `Locale` to format with no localization.
 
This PR also fixes JDK-8325262 to print `FindException` message without the stack trace to indicate clearer that the given module path is incorrect.

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Commit messages:
 - update copyright header
 - 8321703: jdeps generates illegal dot file containing nodesep=0,500000

Changes: https://git.openjdk.org/jdk/pull/17713/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17713&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8321703
  Stats: 5 lines in 2 files changed: 1 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/17713.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17713/head:pull/17713

PR: https://git.openjdk.org/jdk/pull/17713