Change log for VARONIS

Date Changes
2022-10-08 - Added grok pattern for "LEEF" log type.
- Mapped "severity" to "security_result.severity".
- Mapped "device_version" to "metadata.product_version".
- Mapped "administrative_domain" to "target.administrative_domain"
- Added conditional check for "intermediary_host".
2022-10-07 Bug-Fix:
- Mapped "rt" to "metadata.event_timestamp" if "rt" is not null.