Change log for MCAFEE_DLP

Date Changes
2022-04-13 Enhancement-Added mappings for following fields:
'sev' to 'security_result.severity_details'
'action' to 'security_result.action_details'
'dst' to 'target.user.userid'
'status_id' to 'principal.labels'
'usb_serial_number', 'encrypt', 'volume_serial_number' to 'security_result.detection_fields'
'fail_reason', 'evidence_count', 'total_count', 'total_size', 'class_count', 'class_display', 'count', to 'additional.fields'