Revert "Add sync by bittorrent snapshots (#1160)" (#1194)

cmd/integration/commands/flags.go

cmd/integration/commands/root.go

cmd/integration/commands/stages.go

cmd/state/commands/bodies_snapshot.go

cmd/state/commands/global_flags_vars.go

cmd/state/commands/headers_snapshot.go

cmd/state/commands/remote_seeder.go

cmd/state/commands/seeder.go

cmd/state/commands/snapshot_metainfo.go

cmd/state/commands/verify_headers_snapshot.go

cmd/state/generate/generate_body_snapshot.go

cmd/state/generate/generate_header_snapshot.go

cmd/state/generate/remote_seeder.go

cmd/state/generate/seeder.go

cmd/state/generate/snapshot_metainfo_hash.go

cmd/state/verify/verify_headers_snapshot.go

cmd/utils/flags.go

common/dbutils/bucket.go

eth/backend.go

eth/config.go