Return all known accounts, excluding local accounts.

def _get_external_accounts(self, locals):
        '''
        Return all known accounts, excluding local accounts.
        '''
        users = dict()
        out = __salt__['cmd.run_all']("passwd -S -a")
        if out['retcode']:
            # System does not supports all accounts descriptions, just skipping.
            return users
        status = {'L': 'Locked', 'NP': 'No password', 'P': 'Usable password', 'LK': 'Locked'}
        for data in [elm.strip().split(" ") for elm in out['stdout'].split(os.linesep) if elm.strip()]:
            if len(data) < 2:
                continue
            name, login = data[:2]
            if name not in locals:
                users[name] = {
                    'login': login,
                    'status': status.get(login, 'N/A')
                }

        return users