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fix(net): reset io_uring multiqueue state

<IoUring as Backend<D>>::reset() was a no-op and VirtioIoUring lacked a
reset callback, so resetting a tap::Net device backed by io_uring kept
extra multiqueue tap sockets open instead of returning to a single
active queue pair (VirtIO 1.4 Sec 5.1.9.5.6.2: "After initialization of
reset, the device MUST queue packets only on receiveq1").

Add a default VirtioIoUring::reset(&mut self) {} method, call it from
IoUring::reset(), and truncate tap_sockets to 1 while clearing
driver_feature in both VirtioIoUring::reset() and VirtioMio::reset().

Signed-off-by: Changyuan Lyu <changyuanl@google.com>

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