JSONSchema Upgrade and Enhancements

[mfeit-internet2]

Some things to do:

• Upgrade python3-jsonschema to the latest version. Ours is very old because there are old, unsupported pythons we are/were still distributing for. See Upgrade python-jsonschema to latest #1446.

• Drop use of /local in favor of $defs. See https://json-schema.org/understanding-json-schema/structuring#defs.

• Remove /local support in pscheduler-build-enumeration.

• Fix this warning that occurs in the JSON dictionary's tester:

mfeit-dev $ ./run-tests --prefix pScheduler "json-dictionary.json" "./tests"
/home/mfeit/work/pscheduler/pscheduler-json-dictionary/pscheduler-json-dictionary/./run-tests:95: DeprecationWarning: Accessing jsonschema.draft7_format_checker is deprecated and will be removed in a future release. Instead, use the FORMAT_CHECKER attribute on the corresponding Validator.
  format_checker=jsonschema.draft7_format_checker
/home/mfeit/work/pscheduler/pscheduler-json-dictionary/pscheduler-json-dictionary/./run-tests:99: DeprecationWarning: jsonschema.exceptions.RefResolutionError is deprecated as of version 4.18.0. If you wish to catch potential reference resolution errors, directly catch referencing.exceptions.Unresolvable.
  except (jsonschema.exceptions.ValidationError, jsonschema.exceptions.RefResolutionError) as ex: