[%CFEngine_function_prototype(module, args)%]
Description: Execute CFEngine module script module with args, and
return whether successful.
The module script is expected to be located in the registered modules
directory, WORKDIR/modules.
[%CFEngine_function_attributes(module, args)%]
Example:
```cf3 bundle agent test { classes:
# returns $(user)
"done" expression => usemodule("getusers","");
commands:
"/bin/echo" args => "test $(user)"; } ```