RFR: 8271303: jcmd VM.cds {static, dynamic}_dump should print more info [v2]

[Yumin Qi]

> Hi, please review the change for printing more info in jcmd terminal when dump shared archives. The ultimate shared archive file name is formed in java function (CDS.dumpSharedArchive) so to get the final archive name, the signature of CDS.dumpSharedArchive changed to return the archive name. At the end of dumping, return the archive name back to the caller so we can print out it in jcmd terminal.
> 
> Tests: ter1-4
>            manually checked the output of jcmd execution.
> 
> Thanks
> Yumin

Yumin Qi has updated the pull request incrementally with one additional commit since the last revision:

  Fixed absolute path issue

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5643/files
  - new: https://git.openjdk.java.net/jdk/pull/5643/files/e0310efc..fd8efd5d

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5643&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5643&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5643.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5643/head:pull/5643

PR: https://git.openjdk.java.net/jdk/pull/5643