Correct config manager deprecation warning

lib/ansible/config/manager.py

@@ -365,4 +365,5 @@ class ConfigManager(object):
             sys.stderr.write("Unable to set correct type for:\n\t%s\n" % '\n\t'.join(self.UNABLE))
         if self.DEPRECATED:
             for k, reason in self.DEPRECATED:
-                sys.stderr.write("[DEPRECATED] %s: %(why)s. It will be removed in %(version)s. As alternative %(alternative)s", (k, reason))
+                sys.stderr.write("[DEPRECATED] %(k)s: %(why)s. It will be removed in %(version)s. As alternative use one of [%(alternatives)s]\n"
+                                 % dict(k=k, **reason))