Rename php5-fpm role to php-fpm

In Ubuntu 16.04 the package is now called just "php-fpm" and it
makes more sense to just have this role be called that.

roles/php-fpm/handlers/main.yml

@@ -0,0 +1,5 @@
+---
+- name: restart php5-fpm
+  service: name=php5-fpm state=restarted
+
+# vim: set ts=2 sw=2: