@CommandScan does not include commands during testing

[Andras-Csanyi]

Summary

@CommandScan does not work in testing, but @EnableCommand works

Case 1:

• this application works as expected
• test is available here
• the commands are available and the component does what is expected from it, meaning loaded via Spring Boot

Case 2:

• modify this application in a way described below:

• @EnableCommand(FooCommand.class)

• @CommandScan @SpringBootApplication public class SpringshellApplication {

  public static void main(String[] args) { SpringApplication.run(SpringshellApplication.class, args); }

}

- execute the test linked above
- observe the result which does not lists the available commands

## Expected result:
- during testing both annotation should provide what is expected from it

If you can give me a few pointers where to look for I am ok to take a look at it and provide a fix.

[jvalkeal]

This is related/duplicate of #738 and #721. I'm in favour of closing?