Update the host/system info using the input method.

        Return the stats (dict)

def update(self):
        """Update the host/system info using the input method.

        Return the stats (dict)
        """
        # Init new stats
        stats = self.get_init_value()

        if self.input_method == 'local':
            # Update stats using the standard system lib
            stats['os_name'] = platform.system()
            stats['hostname'] = platform.node()
            stats['platform'] = platform.architecture()[0]
            if stats['os_name'] == "Linux":
                try:
                    linux_distro = platform.linux_distribution()
                except AttributeError:
                    stats['linux_distro'] = _linux_os_release()
                else:
                    if linux_distro[0] == '':
                        stats['linux_distro'] = _linux_os_release()
                    else:
                        stats['linux_distro'] = ' '.join(linux_distro[:2])
                stats['os_version'] = platform.release()
            elif (stats['os_name'].endswith('BSD') or
                  stats['os_name'] == 'SunOS'):
                stats['os_version'] = platform.release()
            elif stats['os_name'] == "Darwin":
                stats['os_version'] = platform.mac_ver()[0]
            elif stats['os_name'] == "Windows":
                os_version = platform.win32_ver()
                stats['os_version'] = ' '.join(os_version[::2])
                # if the python version is 32 bit perhaps the windows operating
                # system is 64bit
                if stats['platform'] == '32bit' and 'PROCESSOR_ARCHITEW6432' in os.environ:
                    stats['platform'] = '64bit'
            else:
                stats['os_version'] = ""
            # Add human readable name
            if stats['os_name'] == "Linux":
                stats['hr_name'] = stats['linux_distro']
            else:
                stats['hr_name'] = '{} {}'.format(
                    stats['os_name'], stats['os_version'])
            stats['hr_name'] += ' {}'.format(stats['platform'])

        elif self.input_method == 'snmp':
            # Update stats using SNMP
            try:
                stats = self.get_stats_snmp(
                    snmp_oid=snmp_oid[self.short_system_name])
            except KeyError:
                stats = self.get_stats_snmp(snmp_oid=snmp_oid['default'])
            # Default behavor: display all the information
            stats['os_name'] = stats['system_name']
            # Windows OS tips
            if self.short_system_name == 'windows':
                for r, v in iteritems(snmp_to_human['windows']):
                    if re.search(r, stats['system_name']):
                        stats['os_name'] = v
                        break
            # Add human readable name
            stats['hr_name'] = stats['os_name']

        # Update the stats
        self.stats = stats

        return self.stats