Test hook should only install the python REP from the packages directory

[korydraughn]

Bug Report

The following can break if other plugins exist in the directory and the person running the test hook provides an alternate source for resolving externals packages (i.e. that alternative externals location doesn't contain all the required packages).

irods_rule_engine_plugin_python/irods_consortium_continuous_integration_test_hook.py

Lines 22 to 26 in 674f565

	if options.do_setup:
	built_packages_root_directory = options.built_packages_root_directory
	plugin_dir = irods_python_ci_utilities.append_os_specific_directory(built_packages_root_directory)
	irods_python_ci_utilities.install_os_packages_from_files([os.path.join(plugin_dir, entry) for entry in os.listdir(plugin_dir)])
	irods_python_ci_utilities.subprocess_get_output(['sudo', 'su', '-', 'irods', '-c', 'python3 scripts/setup_python_rule_engine_as_only_rule_engine.py'], check_rc=True)

See the following for what it should do.

• https://github.com/irods/irods_rule_engine_plugin_logical_quotas/blob/f62d3da95402e0d53cef47520a12c7ca47997167/irods_consortium_continuous_integration_test_hook.py#L21-L29