[11u] RFR: 8223464: Improve version string for Oracle CI builds

[Lindenmaier, Goetz]

Hi

I would like to downport this for parity with 11.0.7-oracle.
It does not apply due to changes in context.

http://cr.openjdk.java.net/~goetz/wr19/8223464-OracleCI_version_string-jdk11/01/
https://bugs.openjdk.java.net/browse/JDK-8223464

http://hg.openjdk.java.net/jdk/jdk/rev/5600f5c38b0b

Best regards,
  Goetz.