RTEMS monitor commands and the shell

[Chris Johns]

Hi,

The monitor commands are registered automatically in `rtems_shell_init_once()`
which means an application has no control over these being present, the command
mix and naming, for example there is a `config` command in the monitor.

I am not sure what to do, if it is removed some applications may break assuming
these commands are present. A way to disable the command using shellconfig.h
would be nice.

Suggestions?

Chris