MessageBroker tests are flaky

[mauroservienti]

The multi threading one(s) regularly hang and the build times out. The whole task/thread based implementation of the broker should probably be reviewed.

• fix on master Mark created tasks as long running #479
  • re-enable disabled tests on master: MessageBroker_broadcast_from_multiple_thread_should_not_fail Enable disabled test #481
• backport to 2.1.0 Mark created tasks as long running (on release 2.1) #483
• backport to 2.0.0 Mark created tasks as long running (on release 2.0) #482
• backport to 1.6.x

[workgroupengineering]

from the test I made, to solve this issue, you need to add TaskCreationOptions.LongRunning to the following lines:

Radical/src/Radical/Messaging/MessageBroker.cs

Lines 513 to 516 in 038a9d0

	factory.StartNew(() =>
	{
	sub.Invoke(sender, message);
	});

Radical/src/Radical/Messaging/MessageBroker.cs

Lines 553 to 556 in 038a9d0

	tasks.Add(factory.StartNew(() =>
	{
	sub.Invoke(sender, message);
	}));

[mauroservienti]

Thanks @workgroupengineering, I raised #479.

[workgroupengineering]

Thanks to you, I learned a lot by studying your code.