[BUG] Pull command hang on Windows

[Alexander Belchenko]

Alexander Belchenko wrote:
> It seems that pull command after some operations is hang on Windows.
> Selftest also hang on test "Pull changes from one branch to another."

Log from pull command is attached. Hanging occurs after copying 
repository data and before (or during?) copying actual files contents.

In testing used files from blackbox.test_pull.

Alexander