Include apache/_core.conf in wsgi template for Pike

This patch includes _core.conf template from Apache to make sure
keepalives are disabled for host when SSL is configured.

More info may be found here https://bugs.launchpad.net/devstack/+bug/1630664
And here https://review.openstack.org/#/c/433738/

Change-Id: Ie94c3969b573d0e24640de0898efbc9cc8690bee
diff --git a/keystone/files/pike/wsgi-keystone.conf b/keystone/files/pike/wsgi-keystone.conf
index 3c18ef8..eca9ddf 100644
--- a/keystone/files/pike/wsgi-keystone.conf
+++ b/keystone/files/pike/wsgi-keystone.conf
@@ -122,6 +122,7 @@
 
 <VirtualHost {% if server.bind.address is defined %}{{ server.bind.address }}{% else %}{{ server.bind.public_address }}{% endif %}:5000>
 {%- include "apache/files/_name.conf" %}
+{%- include "apache/files/_core.conf" %}
 {%- include "apache/files/_ssl.conf" %}
 {%- include "apache/files/_locations.conf" %}
 
@@ -167,6 +168,7 @@
 
 <VirtualHost {% if server.bind.address is defined %}{{ server.bind.address }}{% else %}{{ server.bind.public_address }}{% endif %}:35357>
 {%- include "apache/files/_name.conf" %}
+{%- include "apache/files/_core.conf" %}
 {%- include "apache/files/_ssl.conf" %}
 {%- include "apache/files/_locations.conf" %}