Support callbacks on virStream APIs in remote driver client
The current remote driver code for streams only supports blocking I/O mode. This is fine for the usage with migration but is a problem for more general use cases, in particular bi-directional streams. This adds supported for the stream callbacks and non-blocking I/O. with the minor caveat is that it doesn't actually do non-blocking I/O for sending stream data, only receiving it. A future patch will try to do non-blocking sends, but this is quite tricky to get right. * src/remote/remote_driver.c: Allow non-blocking I/O for streams and support callbacks
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