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Improve the remote shell's performance by switching to a virtio channel

Currently the serial link-based transfer of data between host and guest is so slow (400 Kbaud) that I think we’ve consciously avoided adding some useful features that depend on fast file IO, e.g. dumping the output of tails-debugging-info as a scenario failure artifact. Also, the data transfer delay of the thousands of remote shell calls we do each full test suite run add up, so I expect that run time will decrease measurably.

Feature Branch: wip/11888-remote-shell-virtio-transport

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Original created by @anonym on 11888 (Redmine)

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