resultsdb: restart httpd on error

We have been getting lots of OOM kills on httpd on resultsdb01.
This should at least mitigate it until we can sort out why it's
happening.

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

roles/ci_resultsdb/files/httpd.service

@@ -0,0 +1,2 @@
+[Service]
+Restart=on-failure

roles/ci_resultsdb/tasks/main.yml

@@ -7,6 +7,13 @@
   tags:
   - packages
 
+- name: override httpd service to restart on failure
+  copy: dest=/etc/systemd/system/httpd.service
+        src=httpd.service
+  notify:
+    - reload systemd
+    - reload httpd
+        
 - name: Create /etc/ci-resultsdb-listener/
   file: name=/etc/ci-resultsdb-listener/
         state=directory