[issue20130] asyncio: implement a synchronous executor if concurrent.futures is missing

[STINNER Victor]

STINNER Victor added the comment:

Here is an implementation of a synchrounous executor:
https://bitbucket.org/haypo/trollius/commits/1bc2c23854e6717007a5a6df42470afa49c79b99

The changes are larger than what I expected. On Python 3.4, if concurrent.futures is only missing on FreeBSD 6, I agree that it's ok to ask users to upgrade their OS.

@Guido: Are you interested by this change, since Tulip requires at least Python 3.3 which has also concurrent.futures?

The fallback is probably only needed by the Trollius project in practice.

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