r/haproxy: Clean up for modern haproxy versions

The current version of *haproxy* packaged in Fedora already enables
configuration via fragments in a drop-in directory, though it uses
a different path by default.  I still like separating the global
configuration from the defaults, though, and keeping the main
`haproxy.cfg` file empty.

roles/haproxy/files/haproxy-config.conf

@@ -1,2 +0,0 @@
-[Service]
-Environment=CONFIG=/etc/haproxy

roles/haproxy/tasks/main.yml

@@ -11,39 +11,35 @@
   tags:
   - install
 
-- name: ensure haproxy unit configuration extension directory exists
-  file:
-    path=/etc/systemd/system/haproxy.service.d
-    mode=0755
-    state=directory
-- name: ensure haproxy config variable override is set
-  copy:
-    src=haproxy-config.conf
-    dest=/etc/systemd/system/haproxy.service.d/config.conf
-    mode=0644
-  notify:
-  - reload systemd
-  - restart haproxy
 - name: ensure default haproxy configuration file is empty
   copy:
-    src=haproxy.cfg
-    dest=/etc/haproxy
-    mode=0644
+    src: haproxy.cfg
+    dest: /etc/haproxy
+    mode: u=rw,go=r
   notify: restart haproxy
 - name: ensure haproxy global configuration is set
   template:
-    src=global.cfg.j2
-    dest=/etc/haproxy/10-global.cfg
-    mode=0644
+    src: global.cfg.j2
+    dest: /etc/haproxy/conf.d/10-global.cfg
+    mode: u=rw,go=r
   notify: restart haproxy
 - name: ensure haproxy defaults are set
   template:
-    src=defaults.cfg.j2
-    dest=/etc/haproxy/20-defaults.cfg
-    mode=0644
+    src: defaults.cfg.j2
+    dest: /etc/haproxy/conf.d/20-defaults.cfg
+    mode: u=rw,go=r
   notify: restart haproxy
 
 - name: ensure haproxy starts at boot
   service:
-    name=haproxy
-    enabled=yes
+    name: haproxy
+    enabled: true
+  tags:
+  - service
+
+- name: ensure haproxy is running
+  service:
+    name: haproxy
+    state: started
+  tags:
+  - service