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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 94d8524086bd by Serhiy Storchaka in branch '2.7':
Issue #19949: The test_xpickle test now tests compatibility with installed
https://hg.python.org/cpython/rev/94d8524086bd

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nosy: +python-dev

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<http://bugs.python.org/issue19949>
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