move implementation to internal/ directory (#828)

internal/replication/replication.go

@@ -0,0 +1,13 @@
+// Package replication implements replication of filesystems with existing
+// versions (snapshots) from a sender to a receiver.
+package replication
+
+import (
+	"context"
+
+	"github.com/zrepl/zrepl/internal/replication/driver"
+)
+
+func Do(ctx context.Context, driverConfig driver.Config, planner driver.Planner) (driver.ReportFunc, driver.WaitFunc) {
+	return driver.Do(ctx, driverConfig, planner)
+}