[issue12196] add pipe2() to the os module

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> support_linux_version.diff: cool, it's even better than the previous patch.
> You can commit it, except if you are motived for a last change: display
> the write also version in the SkipTest message (as it is done actually).

I just added a very similar function for Mac OS X which is a decorator. 
Example: @support.requires_mac_ver(10, 5).

requires_linux_version() should also be a decorator.

----------

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12196>
_______________________________________