[tests] nuke rake task for test related cleanup

Rakefile

@@ -88,6 +88,19 @@ task :real_tests do
   tests(false)
 end
 
+task :nuke do
+  Fog.providers.each do |provider|
+    begin
+      compute = Fog::Compute.new(:provider => provider)
+      for server in compute.servers
+        Formatador.display_line("[#{provider}] destroying server #{server.identity}")
+        server.destroy rescue nil
+      end
+    rescue
+    end
+  end
+end
+
 desc "Generate RCov test coverage and open in your browser"
 task :coverage do
   require 'rcov'