Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=56582
Convert implementations of ActionHook.action(..) to use switch(enum) operator.
Third and the last part: AJP processors.

Potential error spotted: DISPATCH_EXECUTE is not implemented for AJP. Placed a FIXME marker.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1599395 13f79535-47bb-0310-9956-ffa450edef68