Properly set FD_LIMIT in sysv init when install from package

The default['cassandra']['limits']['nofile'] attribute is not used when
installing from a package. This change runs a simple sed command to
replace the existing value with the value specified in the attribute.

recipes/datastax.rb

@@ -90,6 +90,7 @@
     options '--force-yes -o Dpkg::Options::="--force-confold"'
     # giving C* some time to start up
     notifies :run, 'ruby_block[sleep30s]', :immediately
+    notifies :run, 'execute[set_fd_limit]', :immediately
     notifies :run, 'execute[set_cluster_name]', :immediately
   end
 
@@ -100,6 +101,12 @@
     action :nothing
   end
 
+  execute 'set_fd_limit' do
+    command "sed -i -e 's/^FD_LIMIT=.*$/FD_LIMIT=#{node['cassandra']['limits']['nofile']}/' /etc/init.d/#{node['cassandra']['service_name']}"
+    notifies :restart, 'service[cassandra]', :delayed
+    action :nothing
+  end
+
   execute 'set_cluster_name' do
     command "/usr/bin/cqlsh -e \"update system.local set cluster_name='#{node['cassandra']['cluster_name']}' where key='local';\"; /usr/bin/nodetool flush;"
     notifies :restart, 'service[cassandra]', :delayed