Added support for checking recommended computer resources in integtests

[bieryAtFnal]

Description

In DUNE-DAQ/daqsystemtest#292, Eric asked about the possibility of separately checking required computer resources in an integtest compared to recommended computer resources.

This PR has changes to add the support for recommended computer resources to the existing support for required ones.

These changes are now needed to test the ones in DUNE-DAQ/daqsystemtest#292.

Type of change

• Optimization (non-breaking change that improves code/performance)

Testing checklist

• Minimal system quicktest passes (pytest -s minimal_system_quick_test.py)
• Full set of integration tests pass (dunedaq_integtest_bundle.sh)

Further checks

• Code is commented where needed, particularly in hard-to-understand areas

[eflumerf]

Looks good to me. I might be requesting a command-line flag to bypass these checks entirely, since they don't play very well with my virtual machine's dynamic memory management.