When poll() is called via netmap, txsync is initially called,
and if there are no available buffers to reclaim, it waits for the driver
to notify of new buffers. Since the TX IRQ is generally not used in iflib
drivers, this ends up causing a timeout.

Work around this by having the reclaim DELAY(1) if it's initially unable
to reclaim anything, then schedule the tx task, which will spin by continuously
rescheduling itself until some buffers are reclaimed. In general, the delay is
enough to allow some buffers to be reclaimed, so spinning is minimized.

Test on high-speed links to ensure that the DELAY() doesn't
introduce extra latency.