Fix the -jvm-debug and -h flags in the ash template

[qwe2]

This should fix issues like #1523

[lightbend-cla-validator]

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[lightbend-cla-validator]

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[lightbend-cla-validator]

Hi @qwe2,

Thank you for your contribution! We really value the time you've taken to put this together.

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[qwe2]

Interestingly the addDebugger syntax from bash-template is only compatible with Java 9+, but the GH workflow is still pulling JDK 1.8. java_version_check also checks for Java 8, not 9. Not sure if this is intentional...

[muuki88]

Thanks for tackling this 💪

I'll be on vacation . Maybe @dwickern can take a look 😊

[qwe2]

I've been a bit busy and wasn't sure what to do about Java 8 compat, but I ended up adding some checks so that -jvm-debug works on both ash and bash for Java 8 as well.