RFR: JDK-8299470: sun/jvm/hotspot/SALauncher.java handling of negative rmiport args

Mon Jan 2 14:38:32 UTC 2023

The test serviceability/sa/sadebugd/SADebugDTest.java can pass under some circumstances a negative rmiport (--rmiport -1) to SALauncher.java.
This leads to a somewhat misleading message 
`[debugd] Argument is expected for 'rmiport' `
(we set an argument [-1] but probably this is not what is really expected) and additionally the real exception is not shown.
Probably also a warning in case of negative rmiport values should be printed because they seem to lead to errors.

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Commit messages:
 - JDK-8299470

Changes: https://git.openjdk.org/jdk/pull/11811/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11811&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8299470
  Stats: 6 lines in 1 file changed: 5 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/11811.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11811/head:pull/11811

PR: https://git.openjdk.org/jdk/pull/11811