Added a few small enhancements to the integtest bundle script

[bieryAtFnal]

Description

These changes are intended to be included in the fddaq-v5.7.0 software release...

The changes include the following:

• the addition of a --random-subset <count> option to the bundle script to support running a specified number of randomly-selected integtests
• the addition of a -R <repo> option to the bundle script to allow users to specify one or more repositories that should not be included in the set of tests that are run
• support for multiple instances of -r, -k, and -x options in the bundle script
• the fixing of a bug in the bundle script when tests were run from a base release (instead of from the local software area). When the bug was hit, there would be a complaint about an unexpected -p argument, and the integtest would fail.

To support the -R option in the bundle script, a -x/--exclude option was added to the list_available_integtests.sh script.

To test these changes, I suggest

• include this branch in a local software area
• rebuild the software area
• run commands like the following:
  • list_available_integtests.sh all -x "asiolibs|crtmodules|hsilibs"
  • dunedaq_integtest_bundle.sh --list -r all -R hsilibs -x ehn1 -x large
  • dunedaq_integtest_bundle.sh --list -r all -R 'asiolibs|crtmodules|hsilibs' -x ehn1 --random 5

Type of change

• New feature or enhancement (non-breaking change which adds functionality)

Testing checklist

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

[eflumerf]

New features all appear to work correctly