[issue3489] add rotate{left,right} methods to bytearray

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I think you rather need the inplace shift operation. Or even the move the tail of buffer to the start without filling the remaining. I.e. something like

    buffer[:size] = buffer[-size:]

but without creating immediate bytes object. Now it may be written as:

    buffer[:size] = memoryview(buffer)[-size:]

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nosy: +serhiy.storchaka

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<http://bugs.python.org/issue3489>
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