"rate" limiting breaking user recipe

[jujugrrr]

It seems this remote_block file triggers error from raw.github.com :
https://github.com/rackops/rackops_rolebook/blob/master/recipes/rack_user.rb#L14

By example I have this kind of errors :

�[0m    �[31mError executing action create on resource 'remote_file[/tmp/kitchen/cache/authorized_keys]'�[0m�[34m       
�[0m    ================================================================================�[0m�[34m       
�[0m    �[34m       
�[0m�[0m    Net::HTTPFatalError�[0m�[34m       
�[0m    -------------------�[0m�[34m       
�[0m    503 "Maximum threads for service reached"�[0m�[34m       
�[0m    �[34m       
�[0m�[0m    Resource Declaration:�[0m�[34m       
�[0m    ---------------------�[0m�[34m       
�[0m    # In /tmp/kitchen/cache/cookbooks/rackops_rolebook/recipes/rack_user.rb�[34m       
�[0m�[0m    �[34m       
�[0m�[0m     13: remote_file "#{Chef::Config[:file_cache_path]}/authorized_keys" do�[34m       
�[0m�[0m     14:   source 'https://raw.github.com/rackops/authorized_keys/master/authorized_keys'�[34m 

503 "Maximum threads for service reached