pbTests: Fixup buildJDK arguments in QPC & export buildJDK vars

[Willsparker]

ref: #2121

Currently QPC is failing on a few platforms that should be stable. It was due to #1962 not updating the script to reflect buildJDK.sh's arguments. Amazing how the author of that PR didn't realise .. 👀 .

In my testing, I noticed that often the make-adopt-build-farm.sh wouldn't pickup on variables that were being set as part of buildJDK.sh. When the build scripts started defaulting most arguments, This just needed those variables exported. I've gone back to making openj9 the default as this tests more dependencies for our playbooks.

Checklist

• commit message has one of the standard prefixes
• FAQ.md updated if appropriate
• other documentation is changed or added (if applicable)
• playbook changes run through VPC or QPC (if you have access) QPC
• for inventory.yml changes, bastillion/nagios/jenkins updated accordingly

[sxa]

Looks ok so I'm happy for you to merge this if this has been tested and works, although I'm somewhat surprised this ever worked if the variables weren't being exported

[Willsparker]

I'm somewhat surprised this ever worked if the variables weren't being exported

So am I ...