[issue13968] Support recursive globs

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

In fact glob() is already protected against an endless recursion (in the same way as Bash). The level of recursion is simply limited by the maximum length of the path. So I did not change the implementation, I have just added a test for symlink loop. I also corrected the other new tests so that they should not fail on the platform without symlinks.

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stage: needs patch -> patch review
Added file: http://bugs.python.org/file28728/glob_recursive_3.patch

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