refactor(StakeManager): remove unused startTime field in Epoch struct… #308

Job	Run time
lint	19s
lint	19s
lint	19s
lint	19s
lint	19s
lint	19s
build	20s
build	20s
build	20s
build	20s
build	20s
build	20s
test	28s
test	28s
test	28s
test	28s
test	28s
test	28s
coverage	1m 22s
coverage	1m 22s
coverage	1m 22s
coverage	1m 22s
coverage	1m 22s
coverage	1m 22s
verify (verify:stake_vault)	4m 0s
verify (verify:stake_vault)	4m 0s
verify (verify:stake_vault)	4m 0s
verify (verify:stake_vault)	4m 0s
verify (verify:stake_vault)	4m 0s
verify (verify:stake_vault)	4m 0s
verify (verify:stake_manager)	38m 19s
verify (verify:stake_manager)	26m 4s
verify (verify:stake_manager)	25m 59s
verify (verify:stake_manager)	24m 40s
verify (verify:stake_manager)	26m 54s
verify (verify:stake_manager)	24m 40s
verify (verify:stake_manager_process)	1m 52s
verify (verify:stake_manager_process)	1m 52s
verify (verify:stake_manager_process)	1m 52s
verify (verify:stake_manager_process)	1m 52s
verify (verify:stake_manager_process)	1m 52s
verify (verify:stake_manager_process)	1m 52s
verify (verify:stake_manager_start_migration)	12m 31s
verify (verify:stake_manager_start_migration)	12m 31s
verify (verify:stake_manager_start_migration)	12m 31s
verify (verify:stake_manager_start_migration)	12m 31s
verify (verify:stake_manager_start_migration)	12m 31s
verify (verify:stake_manager_start_migration)	12m 31s
	4h 51m 48s

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