Memory leak in tools.parsl_task_queue.task_list

[frobnitzem]

The get_task_results method only removes tasks from self.task_list if they are 'exec_done' or 'failed'.
Parsl defines a lot of other task states.
Those other ones won't get deleted from self.task_list, leaking both the Future objects and any associated resources.

ALF/alframework/tools/tools.py

Lines 257 to 264 in f7532fd

	for taski,task in reversed(list(enumerate(self.task_list))):
	task_status = task.task_status()
	if task_status == 'exec_done' and task.done:
	results_list.append(task.result())
	del self.task_list[taski]
	elif task_status == 'failed':
	failed_number += failed_number
	del self.task_list[taski]

This will also throw off the count in get_queued_number.

While we're at it, we can log the result when task_status == 'failed'.