Simplified way for issuing module commands

Currently, the structure for module commands is

maxctrl call command (module) (command) (object)

For instance:

maxctrl call command wcar stop MyWcar

Since all objects in MaxScale have unique names, it is quite unnecessary that the module must be specified explicitly. Further, it is confusing that the the command itself, e.g. stop must be specified before the object on which it is applied.

A simpler structure would be:

maxctrl call command (object) (command)

For instance:

maxctrl call command MyWcar stop