go/oasis-node/cmd/storage: Make compact command experimental

I prefer to release this as experimental first, due to the
known corner case where compacting, then syncing only little
data and finally compacting once more, may at the peak of the
compaction consume 2x of the database disk space.

Author: martintomazic

go/oasis-node/cmd/storage/storage.go

@@ -60,11 +60,14 @@ var (
 	}
 
 	storageCompactCmd = &cobra.Command{
-		Use:   "compact",
+		Use:   "compact-experimental",
 		Args:  cobra.NoArgs,
-		Short: "trigger compaction for all the databases",
-		Long:  "Optimize the storage for all the databases by doing the manual compaction",
-		RunE:  doDBCompactions,
+		Short: "EXPERIMENTAL: trigger compaction for all consensus databases",
+		Long: `EXPERIMENTAL: Optimize the storage for all consensus databases by manually compacting the underyling storage engines.
+
+WARNING: Ensure you have at least as much of a free disk as your largest database.
+`,
+		RunE: doDBCompactions,
 	}
 
 	logger = logging.GetLogger("cmd/storage")