Add to_bytes to identity #2154

Job	Run time
check	23s
rustfmt	7s
integration-test-althea-payment	11m 4s
clippy	3m 40s
integration-test-debts	12m 25s
audit	15s
integration-test-eth-payments	10m 16s
integration-test-five-nodes	12m 5s
integration-test-multi-exit	8m 35s
integration-test-validate-contract	16m 53s
test	2m 53s
integration-test-db-migration	6m 59s
cross-armv7	1m 7s
cross-aarch64	1m 16s
	1h 27m 58s

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