Change log for BLUECAT_DDI

Date Changes
2022-11-08 - Added grok for newly ingested logs for log_type - "agetty", "syslog-ng", "systemd".
- Added grok pattern for log_type - "named", "systemd", "CRON", "agetty", "syslog-ng" and it's respective mappings for the fields in the log_type mentioned above.
2022-09-01 - Modified "event_type" from "GENERIC_EVENT" to "USER_UNCATEGORIZED" to reduce generic percentage.
2022-08-16 - Added udm mapping
"metadata.vendor_name" to "Bluecat Networks"
"metadata.product_name" to "Bluecat DDI"
2022-05-05 - Added checks for query_type field.