koji_hub: event has a bug, switch to worker mpm mode

Seems the rhel7 apache hits https://bz.apache.org/bugzilla/show_bug.cgi?id=53555
so switch over to worker mode instead of event.

Signed-off-by: Kevin Fenzi <kevin@scrye.com>

roles/koji_hub/files/00-mpm.conf

@@ -9,10 +9,10 @@
 # multi-threaded multi-process web server
 # See: http://httpd.apache.org/docs/2.4/mod/worker.html
 #
-#LoadModule mpm_worker_module modules/mod_mpm_worker.so
+LoadModule mpm_worker_module modules/mod_mpm_worker.so
 
 # event MPM: A variant of the worker MPM with the goal of consuming
 # threads only for connections with active processing
 # See: http://httpd.apache.org/docs/2.4/mod/event.html
 #
-LoadModule mpm_event_module modules/mod_mpm_event.so
+#LoadModule mpm_event_module modules/mod_mpm_event.so

roles/koji_hub/templates/kojiweb.conf.j2

@@ -2,10 +2,13 @@ RewriteEngine On
 RewriteRule ^/$ /koji/  [R,L]
 KeepAlive On
 
-StartServers           150
-ServerLimit            900
-MaxRequestWorkers      900
-MaxRequestsPerChild    10000
+ServerLimit         35
+StartServers        50
+MaxRequestWorkers   875
+MinSpareThreads     25
+MaxSpareThreads     75
+ThreadsPerChild     25
+MaxConnectionsPerChild 1000
 
 #We use wsgi by default
 Alias /koji "/usr/share/koji-web/scripts/wsgi_publisher.py"