Change miner key name #1567

Job	Run time
check	40s
check	40s
clippy	42s
clippy	42s
rustfmt	9s
rustfmt	9s
test	5m 8s
test	5m 8s
audit	20s
audit	20s
cross-armv7	50s
cross-armv7	50s
cross-mipsel	44s
cross-mipsel	44s
cross-aarch64	43s
cross-aarch64	43s
cross-mips	1m 16s
cross-mips	1m 16s
integration-test-five-nodes	12m 35s
integration-test-five-nodes	12m 35s
integration-test-eth-payments	14m 35s
integration-test-eth-payments	14m 35s
integration-test-db-migration	12m 54s
integration-test-db-migration	12m 54s
integration-test-althea-payment	16m 27s
integration-test-althea-payment	16m 27s
integration-test-debts	14m 2s
integration-test-debts	22m 35s
integration-test-multi-exit	13m 5s
integration-test-multi-exit	13m 5s
integration-test-validate-contract	13m 1s
integration-test-validate-contract	13m 1s
	3h 42m 55s

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