proxies: Override the httpd systemd unit file to up file limit and restart on failure

The proxies seem to be hitting file limits, so try increasing them.
Also, set httpd to restart on failure, this should help mask the problem
if it persists with the higher limit.

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

roles/httpd/proxy/files/httpdoverride.conf

@@ -0,0 +1,3 @@
+[Service]
+LimitNOFILE=98304
+Restart=on-failure

roles/httpd/proxy/tasks/main.yml

@@ -97,3 +97,19 @@
   - httpd
   - httpd/proxy
   - disablesystemdoomd
+
+- name: create systemd drop in dir for httpd
+  file: path=/etc/systemd/system/httpd.service.d/ state=directory
+  tags:
+  - httpd
+  - httpd/proxy
+  - httpdoverride
+
+- name: create systemd drop in dir for httpd
+  copy: src=httpdoverride.conf dest=/etc/systemd/system/httpd.service.d/httpdoverride.conf
+  tags:
+  - httpd
+  - httpd/proxy
+  - httpdoverride
+  notify:
+  - reload systemd