refactoring via goimports

main.go

packages/accountability/accountability.go

packages/bitutils/bitmask.go

packages/bitutils/bitmask_test.go

packages/byteutils/byteutils.go

packages/curl/batch_hasher.go

packages/curl/bct_curl.go

packages/curl/curl.go

packages/curl/curlp81.go

packages/daemon/daemon.go

packages/daemon/events.go

packages/database/database.go

packages/database/interfaces.go

packages/database/logger.go

packages/database/parameters.go

packages/datastructure/doubly_linked_list.go

packages/datastructure/lru_cache.go

packages/errors/errors.go

packages/errors/stack.go

packages/events/closure.go