Update stats using SNMP.

        If bulk=True, use a bulk request instead of a get request.

def get_stats_snmp(self, bulk=False, snmp_oid=None):
        """Update stats using SNMP.

        If bulk=True, use a bulk request instead of a get request.
        """
        snmp_oid = snmp_oid or {}

        from glances.snmp import GlancesSNMPClient

        # Init the SNMP request
        clientsnmp = GlancesSNMPClient(host=self.args.client,
                                       port=self.args.snmp_port,
                                       version=self.args.snmp_version,
                                       community=self.args.snmp_community)

        # Process the SNMP request
        ret = {}
        if bulk:
            # Bulk request
            snmpresult = clientsnmp.getbulk_by_oid(0, 10, itervalues(*snmp_oid))

            if len(snmp_oid) == 1:
                # Bulk command for only one OID
                # Note: key is the item indexed but the OID result
                for item in snmpresult:
                    if iterkeys(item)[0].startswith(itervalues(snmp_oid)[0]):
                        ret[iterkeys(snmp_oid)[0] + iterkeys(item)
                            [0].split(itervalues(snmp_oid)[0])[1]] = itervalues(item)[0]
            else:
                # Build the internal dict with the SNMP result
                # Note: key is the first item in the snmp_oid
                index = 1
                for item in snmpresult:
                    item_stats = {}
                    item_key = None
                    for key in iterkeys(snmp_oid):
                        oid = snmp_oid[key] + '.' + str(index)
                        if oid in item:
                            if item_key is None:
                                item_key = item[oid]
                            else:
                                item_stats[key] = item[oid]
                    if item_stats:
                        ret[item_key] = item_stats
                    index += 1
        else:
            # Simple get request
            snmpresult = clientsnmp.get_by_oid(itervalues(*snmp_oid))

            # Build the internal dict with the SNMP result
            for key in iterkeys(snmp_oid):
                ret[key] = snmpresult[snmp_oid[key]]

        return ret