[BUGFIX] Fix cache rule for the solr extension download

providers/app.rb

@@ -62,7 +62,7 @@ action :add do
 		timeout 3000000
 		action :run
 		only_if {
-			not ::File.exists?("#{Chef::Config['file_cache_path']}/ext-solr/README.md")
+			not ::File.exists?("#{Chef::Config['file_cache_path']}/ext-solr-#{new_resource.extension}.tgz")
 		}
 
 		code <<-EOF