Prepare actuator sample to show how to use the telnet connector
Ensure telnet connector gets installed if available on the class path
Polish and rework default authentication method if a Spring Security AuthenticationManager is available

In case a Spring Security AuthenticationManager is found in the app context the auto configuration will change default shell authentication method to auth against Spring Security. In addition shell access will get protected by the specific role configured in SecurityProperties.Management.

Certainly this can be overridden by providing shell.auth and shell.auth.spring.roles.