Make python arcfour_crypt more portable

[Stefan Metzmacher]

Hi Alexander,

>> RHEL7 has only m2crypto.
>> And I see python-cryptography only on SLE12.
> No, python-cryptography is in RHEL7, starting with 7.2, and we are
> trying to avoid using m2crypto and standardize on python-cryptography.
> python-cryptography is a way froward to support both Python2 and
> Python3 upstream-wise.

Ok, but we also need to support RHEL 7.0 and 7.1...

>> As my code is better than the current state, I'd suppose that
>> we take it as is. This fixes a bug and should be backported to 4.3
>> and 4.4.
>>
>> We can do any further improvement later e.g. for python3 support later
>> in master.
> I agree with this, however, I'll come up with additional patches for
> 4.3/4.4 for python-cryptography as well by the time Samba will be
> rebased in RHEL7.

Sure, can I push with your Reviewed-by: for now?

Thanks!
metze

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