Add labels for passwords, fix output of exceptions, fix passwd output.

Passwords didn't have internationalizable labels.

Exceptions that occured during required input weren't printed as unicode
so weren't being translated properly.

Don't use output_for_cli() directly in the passwd plugin, use output.Output.

ticket 352

ipalib/cli.py

@@ -903,7 +903,7 @@ class cli(backend.Executioner):
                     error = None
                     while True:
                         if error is not None:
-                            print '>>> %s: %s' % (param.label, error)
+                            print '>>> %s: %s' % (unicode(param.label), unicode(error))
                         raw = self.Backend.textui.prompt(param.label, default)
                         try:
                             value = param(raw, **kw)