Introduce “--delete-all” option which deletes all MTA managed runtime artifacts

Description

Someone administrating an MTA might not always know what entities were created during the cf deploy. In particular, he might not know if there are service instances or service brokers created.

Thus, it's proposed to have a --delete-all option for cf undeploy to get rid of everything that was created during cf deploy. Thus, so he can be sure that no manual cleanup is necessary afterwards.

Expected behavior

The --delete-all option should act the same as providing --delete-services --delete-service-brokers to the undeploy command.

An example usage would be:
cf undeploy my.example.mta --delete-all

Internal Tracking Number:

LMCROSSITXSADEPLOY-546

Inizia dalla gestione delle opzioni del comando cf undeploy e confronta il comportamento esistente di --delete-services e --delete-service-brokers. Aggiungi --delete-all in modo che abbia lo stesso effetto della specifica di entrambe le opzioni esistenti, quindi verifica che il comando di esempio rimuova tutti gli artefatti di runtime gestiti da MTA.