Minor improvements to the copyright-generator

Pushkar Kulkarnirequested to merge
pushkarnk/openjdk:copyright-master into master

The improvements include:

  1. Do not download the source package if one is found in openjdk, openjdk/debian or openjdk/debian/copyright-gen directories.
  2. Gather the licenses in a fixed/sorted order to avoid the randomness introduced by os.scandir()
  3. Redirect output to the copyright file within the Python script. Usage instruction updated.
  4. Add openjdk-23 to the list of supported versions.
  5. Minor logging to stderr.

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