[KARAF-2626] Add load-test and improve threads commands
Fix bundle formatter
Improve support for old commands annotations in namespace handler
Fix subshell scope variable support
[KARAF-2628] Fix synchronization issues in the commands completer
[KARAF-2307] Fix some backward compatibility issues with commands
Fix completes so that they only complete with the correct command (i.e. do not show options for other commands with the same name but a different scope)
Do not register the subshell service multiple times