RFR: 8263342: Add --connect option to jhsdb hsdb/clhsdb

[Yasumasa Suenaga]

Most of subcommands in jhsdb supports to connect to debug server via `--connect` command line option, however `hsdb` and `clhsdb` do not accept it.

Both HSDB and CLHSDB support to connect to debug server, so they should have capability to do it via command line option.

I also filed [CSR for this issue](https://bugs.openjdk.java.net/browse/JDK-8263345). Please review it as well.

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Commit messages:
 - 8263342: Add --connect option to jhsdb hsdb/clhsdb

Changes: https://git.openjdk.java.net/jdk/pull/2908/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2908&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8263342
  Stats: 130 lines in 5 files changed: 114 ins; 4 del; 12 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2908.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2908/head:pull/2908

PR: https://git.openjdk.java.net/jdk/pull/2908