RFR: JDK-8299470: sun/jvm/hotspot/SALauncher.java handling of negative rmiport args [v5]

[Matthias Baesken]

> 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.

Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:

  Small output adjustments

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11811/files
  - new: https://git.openjdk.org/jdk/pull/11811/files/d81273c0..1020fe27

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11811&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11811&range=03-04

  Stats: 4 lines in 3 files changed: 1 ins; 0 del; 3 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