Implements a UDP protocol for fastboot, documented in
fastboot_protocol.txt.
This version of the protocol does not include multi-packet windowing,
which will likely be needed to achieve reasonable speeds over WiFi.
Since we don't have any WiFi use cases yet, we'd like to get this in
now and update the protocol later if it becomes necessary.
Usage:
fastboot -s udp:<hostname>[:port] <command>
Bug: http://b/26154914
Change-Id: Ia5bbae6bcd6405671f594d7120b3994746d234d3
David Pursell