Add Async libraries to Smoke Test for Python

[JonathanCrd]

PR on Python for Smoke Tests #6412 lack the use of the Async clients.

The same actions perform by the smoke test with the not async clients should be performed with the async clients as well.

[danieljurek]

Chatted more with @chlowell .. I think we can unblock this:

To unblock install aiohttp>=3.0 (as seen in https://github.com/Azure/azure-sdk-for-python/blob/master/shared_requirements.txt)

This installs a default network stack that the async implementation can use. This should be added to requirements.txt.