copr: use systemd drop-ins instead of chaning /usr

roles/copr/frontend/files/systemd/system/httpd.service.d/50-oom.conf

@@ -0,0 +1,3 @@
+# Keep httpd master running when child is OOM killed, rhbz#1947475
+[Service]
+OOMPolicy = continue

roles/copr/frontend/files/systemd/system/httpd.service.d/50-restart.conf

@@ -0,0 +1,4 @@
+# When httpd is OOM killed or otherwise failed, start it again
+[Service]
+Restart = on-failure
+RestartSec = 5s

roles/copr/frontend/tasks/httpd.yml

@@ -82,27 +82,6 @@
     regexp: '^LoadModule substitute_module modules/mod_substitute.so'
     line: '#LoadModule substitute_module modules/mod_substitute.so'
 
-- name: Keep httpd master running when child is OOM killed, rhbz#1947475
-  ini_file:
-    path: /usr/lib/systemd/system/httpd.service
-    section: Service
-    option: OOMPolicy
-    value: continue
-    backup: yes
-  notify: restart apache
-
-- name: When httpd is OOM killed or otherwise failed, start it again
-  ini_file:
-    path: /usr/lib/systemd/system/httpd.service
-    section: Service
-    option: "{{ item.option }}"
-    value: "{{ item.value }}"
-    backup: yes
-  with_items:
-    - { option: "Restart", value: "on-failure" }
-    - { option: "RestartSec", value: "5s" }
-  notify: restart apache
-
 - include_role:
     name: keytab/service
   vars:

roles/copr/frontend/tasks/main.yml

@@ -141,6 +141,8 @@
 
 - name: install custom systemd service files
   copy: src=systemd dest=/etc
+  notify:
+  - reload httpd
 
 - name: compress rotated httpd logs
   copy: src="httpd.logrotate" dest="/etc/logrotate.d/httpd"