libvirtaio: convert to using 'async' / 'await' syntax

The 'async' keyword is new in Python 3.5, as a way to declare that a
method is a coroutine. This replaces the '@asyncio.coroutine' decorator
that is deprecated since 3.8 and scheduled to be removed in 3.11

The 'await' keyword has to be used instead of 'yield' from any
coroutines declared with 'async'.

Signed-off-by: Chris Gunn <chrisgun@microsoft.com>
[DB: Split off from a larger patch mixing multiple changes]
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

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