[issue19949] Explicitly skip or mask skipped/disabled tests in test_xpickle

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


----------
assignee:  -> serhiy.storchaka

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19949>
_______________________________________