add await to helpers async when it is a coroutine

[thiagosalvatore]

Q	A
Bug fix?	yes
New feature?	no
BC breaks?	no
Need Doc update	no

Describe your change

Add checking for coroutine on async gen helper to await it instead of just returning.

before:

await (await self.client.search_async)

after:

await self.client.search_async

What problem is this fixing?

When using some async methods that simply returns the async transport (like search_async) we were having to manually call await twice (like below). It was happening because we were only awaiting things on the helper if they were a generator, but not if they were a coroutine.

[thiagosalvatore]

@shortcuts @millotp see what do you think about this change, please