Raise a failed unit, the module's and the machine's (hq issue 315)

A module's failed unit now arrives among its resources and raises the
module's own condition, named by the unit. The machine's own failed
units, which no module places, are one warning for the machine listing
them, cleared when none is listed. Nothing a send moved is among them,
so the gate never holds a send on that finding. The statement's units
are kept with the machine's health (migration 0080) and node show says
them.

cmd/mesh-controller/nodes.go

@@ -634,6 +634,9 @@ func showNode(ctx context.Context, inv *inventory.Inventory, name string) error
 		for _, line := range networkLines(h, had, time.Now()) {
 			fmt.Println(line)
 		}
+		for _, line := range unitsLines(h, had, time.Now()) {
+			fmt.Println(line)
+		}
 	}
 
 	held, err := inv.Profile(ctx, name)