The controller's tools can issue a module its bus account

A module's account was mintable only from the controller's command line,
so a rollout that gave a module one could not be finished through the
mesh's own tools (novox/hq issue 191). The issue verb runs module issue
for a module on a machine; the caller pushes the machine after.

internal/catalogue/verbs.go

@@ -129,6 +129,13 @@ var ControllerVerbs = []Verb{
 			"module":    "an own secret: the module",
 			"secret":    "an own secret: its name in the module's definition",
 		}, nil)},
+	{Name: "issue", Description: "Give a module on a machine its account on the bus: minted, and sealed to the " +
+		"machine as the module's own secret named broker, read at the next push of that machine. For a module " +
+		"whose definition declares that secret; refused with the reason otherwise. Issued again, it replaces the account.",
+		Input: schema(map[string]string{
+			"node":   "the machine that runs the module",
+			"module": "the module's name",
+		}, []string{"node", "module"})},
 	{Name: "build", Description: "Have the build machine build a repository. Answers at once with the build's id: " +
 		"`builds` with that id follows it line by line, and the module is registered when the outcome comes.",
 		Input: schema(map[string]string{