fix(net): Fix potential network hangs, and reduce code complexity #268

Job	Run time
Generate crates matrix	10s
Check crates matrix	4s
Build tower-batch-control crate	22s
Build tower-fallback crate	23s
Build zebra-chain crate	1m 52s
Build zebra-consensus crate	7m 23s
Build zebra-network crate	1m 53s
Build zebra-node-services crate	1m 47s
Build zebra-rpc crate	7m 33s
Build zebra-scan crate	1m 5s
Build zebra-script crate	1m 39s
Build zebra-state crate	7m 6s
Build zebra-test crate	40s
Build zebra-utils crate	7m 55s
Build zebrad crate	11m 3s
Open or update issues for building crates individually failures	0s
	50m 55s

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