Merge r1204104, 1204180:

Remove MPM-private stuff from conn_state_t.

This should make it easier to improve the event MPM in 2.4 without breaking
the API.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1204743 13f79535-47bb-0310-9956-ffa450edef68