Certain instrumentation does not record exception in many tests

[anuraaga]

Grizzly does not seem to record exception in many tests. Need to confirm this is expected, for now I have added testException() return false without knowing if this is precise or not.

Vertx as well.

Probably same reason as Vertx but Netty too. Exception is literally caught by the test and translated into HTTP so doesn't seem to really test anything (presumably instrumentation should be doing something like what the test is doing)

Servlet Async too, there seems to be no way of completing an async context with a throwable. Our tests just throw the exception without it being handled by the instrumentation.

[anuraaga]

My guess is this and #806 will be solved at the same time, those loose assertions allowed these to pass in the first place from what I can tell.