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This patch equips the 'Block::Connection' with a framework API for the implementation of robust block-session clients that perform block I/O in an asynchronous fashion. An application-defined 'JOB' type, inherited from 'Connection::Job', encapsulates the application's context information associated with a block operation. The lifecycle of the jobs is implemented by the 'Connection' and driven by the application's invokation of 'Connection::update_jobs'. The 'update_jobs' mechanism takes three hook functions as arguments, which implement the applications-defined policy for producing and consuming data, and for the completion of jobs. Issue #3283