Add support for incomplete (truncated) search results.

ldap2.find_entries now returns a tuple containing 2 values. First,
a list of entries (dn, entry_attrs), Second, the truncated flag. If
the truncated flag is True, search results hit a server limitation
and are incomplete.

This patch also removes decoding of non-string scalar python types into
unicode (they are left unchanged).

ipalib/encoder.py

@@ -127,7 +127,7 @@ class Encoder(object):
                 var.decode(self.encoder_settings.decode_from)
             )
         elif isinstance(var, (bool, float, int, long)):
-            return self.encoder_settings.decode_postprocessor(unicode(var))
+            return var
         elif isinstance(var, list):
             return [self.decode(m) for m in var]
         elif isinstance(var, tuple):