Default AsyncContext timeout reduced to 30ms

[aaron-steinfeld]

In #251 , the ability to configure the async request timeout was added, but it was defaulted to 30. Because that field is measured in ms, this changes the existing default behavior of a 30s timeout to a 30ms timeout - a significant breaking change for those using the async mode.

To Reproduce
Use the async servlet mode without configuring the timeout.

Expected behavior
Without setting a timeout the default behavior should remain unchanged at 30s.