roles/apache: Configure mod_userdir

By default, per-user directories (i.e. `/~username/`) are disabled in
Fedora's configuration of Apache. This commit introduces a new variable,
`apache_userdir`, which can be used to enable this feature. It should be
set to a string other than *disabled*, which is the path under users'
home directories that will be served, if it is accessible. Normally, the
value would be `public_html`.

roles/apache/tasks/main.yml

@@ -57,6 +57,18 @@
     setype=httpd_config_t
   notify: reload httpd
 
+- name: ensure apache userdir module is configured
+  template:
+    src=userdir.httpd.conf.j2
+    dest=/etc/httpd/conf.d/userdir.conf
+    mode=0644
+  notify: reload httpd
+- name: ensure selinux is configured for apache user directories
+  seboolean:
+    name=httpd_enable_homedirs
+    persistent=yes
+    state={{ 'yes' if apache_userdir is defined else 'no' }}
+
 - name: ensure apache mpm module is configured
   template:
     src=mpm.httpd.conf.j2