CASMCMS-8895 - allow multiple concurrent remote customize jobs.

[dlaine-hpe]

Summary and Scope

Change the scripts to look for an unused port on the remote build node and start / connect to the remote container using that available port. This allows multiple jobs to run instead of having a single hard-coded port that is used.

Issues and Related PRs

• Resolves CASMCMS-8895

Testing

Tested on:

• Tyr

Test description:

I updated the version of the images being used to the test image and ran through multiple scenarios of kicking off many remote customize jobs in rapid succession. In the logs I verified it always correctly sorted out finding an available port with no unhandled collisions.

• Were the install/upgrade-based validation checks/tests run (goss tests/install-validation doc)? N
• Were continuous integration tests run? If not, why? N
• Was upgrade tested? If not, why? N
• Was downgrade tested? If not, why? N
• Were new tests (or test issues/Jiras) created for this change? N

Risks and Mitigations

No riskier than anything else here...

Pull Request Checklist

• Version number(s) incremented, if applicable
• Copyrights updated
• License file intact
• Target branch correct
• CHANGELOG.md updated
• Testing is appropriate and complete, if applicable