roles/php5-fpm: Fix php.ini reconfiguration (pathinfo)

Use replace instead of lineinfile, addresses GitHub issue #1.

Signed-off-by: Alan Orth <alan.orth@gmail.com>

roles/php5-fpm/tasks/main.yml

@@ -18,7 +18,7 @@
 # re-configure php to only process exact paths, see:
 # http://codex.wordpress.org/Nginx
 - name: Update php.ini
-  lineinfile: dest=/etc/php5/fpm/php.ini regexp=^;cgi.fix_pathinfo line=cgi.fix_pathinfo=0
+  replace: dest=/etc/php5/fpm/php.ini regexp='^;cgi\.fix_pathinfo=0$' replace='cgi.fix_pathinfo=0'
   notify: restart php5-fpm
   tags: php5-fpm