Async patches phase 1 - Async means the container thread can back out. This means...

Async patches phase 1 - Async means the container thread can back out. This means that valves need to be async aware. For example, access log valve, can no longer log upon exit of the method since the thread can back out based on async behavior.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@795231 13f79535-47bb-0310-9956-ffa450edef68