Make hourly backups optional

There was a stray arrow style dep that worked unless hourly backups
weren't defined.  If hourly deps weren't defined, then an error about an
invalid dep target would be thrown on puppet 4.

Author: Clayton O'Neill

manifests/server/config.pp

@@ -78,7 +78,7 @@
   file { $log_file :
     ensure  => present,
     require => File[$log_path]
-  } ->
+  }
 
   # cronjobs