Does not work with new version of mysql cookbook

Cookbook mysql moved from recepies to LWRP, that is why in default.rb you need to change 
`include_recipe "mysql::client" if node[:sphinx][:use_mysql]`

to something like this:

```
mysql_client 'default' do
  action :create
  only_if {node[:sphinx][:use_mysql]}
end
```
