Add support for CustomLog format modification

Operators may want to log additional stuff for Keystone
requests like response time. This change adds configurable
log format.

Change-Id: I6c26335877bb3e5de0178d540e3fe72ceac1734c

defaults/main.yml

@@ -158,6 +158,7 @@ keystone_service_adminurl: "{{ keystone_service_adminurl_v3 }}"
 
 ## Apache setup
 keystone_apache_log_level: info
+keystone_apache_custom_log_format: combined
 keystone_apache_servertokens: "Prod"
 keystone_apache_serversignature: "Off"
 keystone_wsgi_threads: 1

releasenotes/notes/os-keystone-apache-log-format-support-7232177f835222ee.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - Added keystone_apache_custom_log_format tunable for
+    changing CustomLog format. Default is "combined".

templates/keystone-httpd.conf.j2

@@ -14,7 +14,7 @@
 
     LogLevel  {{  keystone_apache_log_level }}
     ErrorLog  /var/log/keystone/keystone-apache-error.log
-    CustomLog /var/log/keystone/ssl_access.log combined
+    CustomLog /var/log/keystone/ssl_access.log {{ keystone_apache_custom_log_format }}
     Options +FollowSymLinks
 
     {% if keystone_ssl | bool and keystone_service_internaluri_proto == "https" -%}
@@ -72,7 +72,7 @@
 
     LogLevel  {{  keystone_apache_log_level }}
     ErrorLog  /var/log/keystone/keystone-apache-error.log
-    CustomLog /var/log/keystone/ssl_access.log combined
+    CustomLog /var/log/keystone/ssl_access.log {{ keystone_apache_custom_log_format }}
     Options +FollowSymLinks
 
     {% if keystone_ssl | bool and keystone_service_adminuri_proto == "https" -%}