mpm_event: handle lingering close fully in process_lingering_close().

mpm_event: handle lingering close fully in process_lingering_close().

* server/mpm/event/event.c (start_lingering_close_blocking): Axe the function
  and put the code directly in process_lingering_close() on the first call when
  cs->pub.state == CONN_STATE_LINGER, this simplifies lingering close handling
  from process_socket() and event_resume_suspended().

No functional changes.

Follow up to r1891716.
Github: #208

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1891717 13f79535-47bb-0310-9956-ffa450edef68