subprocess: Fix patched functions with optional argumentssubprocess

Since [1] we monkey patch subprocess module and it uncovered one issue -
the previous patched_function implementation would produce functions
with all optional arguments lacking their default values which made them
required. This is an issue on Python 3 where there's at least one
optional explicit argument in at least one of the functions
(check_call), on Python 2 the function signature has *args and **kwargs
so it wasn't an issue.

This patch is contributed by Smarkets Limited.

[1] 614a20462aebfe85a54ce35a7daaf1a7dbde44a7

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