apps/examples/keypadtest: REMOVED and warehoused in the Obsoleted repository. ...

apps/examples/keypadtest: REMOVED and warehoused in the Obsoleted repository.  This was just a bad clone of apps/examples/hidkbd for a keypad driver that was removed years ago.  It also uses illegal function calls into the OS.  So it has no purpse:  It is redundant, it uses illegal interfaces, and is a test for non-existent code.