RFR: 8276787: Improve warning messages for -XX:+RecordDynamicDumpInfo

[Ioi Lam]

[1] Fixed the error messages for the three scenarios described in the bug report. See the test SharedArchiveFileOption.java for new test cases for these messages.

[2] The global SharedDynamicArchivePath was used for both reading and writing the dynamic archive. Now the writing part is handled by DynamicArchiveBuilder::_archive_name. This simplifies the logic in Arguments::init_shared_archive_paths() and DynamicArchive::dump_for_jcmd(). It also makes the checks in [1] easier to implement.

Testing: running through Oracle CI tiers 1-4.

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Commit messages:
 - fixed trailing whitespaces
 - 8276787: Improve warning messages for -XX:+RecordDynamicDumpInfo

Changes: https://git.openjdk.java.net/jdk/pull/6383/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6383&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8276787
  Stats: 308 lines in 11 files changed: 199 ins; 58 del; 51 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6383.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6383/head:pull/6383

PR: https://git.openjdk.java.net/jdk/pull/6383