fix(StakeManager): fix finalizeEpoch to use last epoch epochEnd #292

Job	Run time
lint	28s
lint	28s
lint	28s
lint	28s
build	18s
build	18s
build	18s
build	18s
coverage	1m 18s
coverage	1m 18s
coverage	1m 18s
coverage	1m 18s
test	32s
test	32s
test	32s
test	32s
verify (verify:stake_vault)	8m 51s
verify (verify:stake_vault)	8m 51s
verify (verify:stake_vault)	8m 51s
verify (verify:stake_vault)	8m 51s
verify (verify:stake_manager)	39m 59s
verify (verify:stake_manager)	26m 27s
verify (verify:stake_manager)	27m 58s
verify (verify:stake_manager)	22m 55s
verify (verify:stake_manager_process)	8m 27s
verify (verify:stake_manager_process)	8m 27s
verify (verify:stake_manager_process)	8m 27s
verify (verify:stake_manager_process)	8m 27s
verify (verify:stake_manager_start_migration)	4m 42s
verify (verify:stake_manager_start_migration)	4m 42s
verify (verify:stake_manager_start_migration)	4m 42s
verify (verify:stake_manager_start_migration)	4m 42s
	3h 35m 43s

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