Fix wait_for_free_tx when ring is full #16
The effect of this is that large transfers would often hang or pause (pinging the unikernel would unstick it).
This change depends on mirage/shared-memory-ring#15
Previously: 1. We waited even if the ring had enough free space (n >= numfree) 2. We checked again as soon as the underlying event channel got an event. However, space doesn't become available in the ring until tx_poll processes the responses, which usually happens after that.
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