- Port back my fixes to this patch.

- Port back my fixes to this patch.
- Correctly pass keepalive value to AprEndpoint.
- Sendfile should use soTimeout (it's a request, not a keepalive).
- Comet poller is also a request in progress so use soTimeout too (most likely it would need its own timeout value).
- I will adjust the defaults further, as for example I think keepALiveTimeout should default to soTimeout if not set
  (ie, if it's -1).

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc6.0.x/trunk@480558 13f79535-47bb-0310-9956-ffa450edef68