Fix timeout on OneShotHandler

[sireliah]

Fixes: #1511

OneShotHandler opened new SubstreamProtocols with default timeout, however the handler could have been configured with different timeout.

[romanb]

The inactive_timeout is actually not intended to be a timeout for outbound substreams, only for connection_keep_alive. In other words, I don't think this is a bug, but rather a feature request for making the timeout on outbound substream requests configurable for the OneShotHandler, which should probably be done with a new configurable setting.

[sireliah]

Ok, that makes sense. Do you think we should have this kind of feature? My use case involved outbound substream that needs very long timeout (for the reason of big payload), but I wonder if anyone would use OneShotHandler similarly.

[tomaka]

Do you think we should have this kind of feature?

To me it's never a bad idea to make things more configurable.
(with some exceptions, for example you don't want for a weird configuration value to be capable of breaking the logic of the code)

So, yes!

[sireliah]

Great, then I'll prepare PR for that!

[sireliah]

Here we go: #1521