Fix untar command.

software/erp5scalabilitytestbed/software.cfg

@@ -50,7 +50,7 @@ eggs =
 [scalability-test-suite]
 recipe = plone.recipe.command
 location = ${buildout:parts-directory}/${:_buildout_section_name_}
-command = tar zxvf -C ${:location} /var/tmp/erp5_scalability_test_suite.tar.gz
+command = tar zxf -C ${buildout:parts-directory} /var/tmp/erp5_scalability_test_suite.tar.gz
 
 [template]
 recipe = slapos.recipe.template