Create a command generator to perform all the snmp query.
        If mibs_path is not None, load the mibs present in the custom mibs
        folder. (Need to be in pysnmp format)

def create_snmp_engine(self, mibs_path):
        '''
        Create a command generator to perform all the snmp query.
        If mibs_path is not None, load the mibs present in the custom mibs
        folder. (Need to be in pysnmp format)
        '''
        snmp_engine = hlapi.SnmpEngine()
        mib_builder = snmp_engine.getMibBuilder()
        if mibs_path is not None:
            mib_builder.addMibSources(builder.DirMibSource(mibs_path))

        mib_view_controller = view.MibViewController(mib_builder)

        return snmp_engine, mib_view_controller