http/client: Pass abort source by pointer #2650
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Currently the client API suggest passing it by reference and for those, that don't want to abort requests there's 2nd set of calls that don't have abort source at all. Internally the reference is converted into a pointer, and the 2nd set of calls passes nullptr.
At the same time users of this API (scylla S3 client) make the reverse "choice" -- it passes abort source by pointer all the way down to http client and then decides which API to call, with abort source reference or without it.
Fix this mess by making client accept abort source by pointer.