Should requests return an operation?

[Temikus]

I think if requests are uncomfortable enough that we have to have this in tests:
https://github.com/fog/fog-google/blob/23878b2d33ea1aecb54fa7d4652b1c77b3e51530/test/helpers/client_helper.rb#L43-L75
, we should just make requests return an operation object we can just use .wait_for on.

So instead of:

    request = @client.insert_backup_run(instance.name, data)
    operation = @operations.new(:service => service).get(request.name)
    operation.wait_for { ready? }

, we should have something like:

    operation = @client.insert_backup_run(instance.name, data)
    operation.wait_for { ready? }

@icco WDYT? Or am I missing something?

[Temikus]

Closing in favor of #381