RFR: 8264322: Generate CDS archive when creating custom JDK image

[Calvin Cheung]

Please review this change for adding a `jlink` command line option `--generate-cds-archive` for generating CDS archives as a post processing step during the creation of a custom JDK image.

Details can be found in the corresponding CSR [JDK-8269178](https://bugs.openjdk.java.net/browse/JDK-8269178).

Testing:

- [x] tiers 1,2 (including the new test)

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Commit messages:
 - fix trailing whitespace
 - 8264322: Generate CDS archive when creating custom JDK image

Changes: https://git.openjdk.java.net/jdk/pull/5174/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5174&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8264322
  Stats: 394 lines in 11 files changed: 354 ins; 7 del; 33 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5174.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5174/head:pull/5174

PR: https://git.openjdk.java.net/jdk/pull/5174