Tarantool connection driver for work with asyncio

Connector required tarantool version 1.6:

$ pip install aiotarantool

Try it example:

import asyncio
import aiotarantool

cnt = 0

async def insert_job(tnt):
    global cnt

    for it in range(2500):
        cnt += 1
        r = await tnt.insert("tester", (cnt, cnt))

loop = asyncio.get_event_loop()

tnt = aiotarantool.connect("127.0.0.1", 3301)
tasks = [loop.create_task(insert_job(tnt))
         for _ in range(40)]

loop.run_until_complete(asyncio.wait(tasks))
loop.run_until_complete(tnt.close())
loop.close()

Under this scheme the aiotarantool driver makes a smaller number of read/write tarantool socket.

See benchmark results time for insert/select/delete 100K tuples on 1.5KBytes:

call	tarantool	aiotarantool
insert	35.938047	12.701088
select	24.389748	12.746204
delete	35.224515	13.905095