Change log for SEP

Date Changes
2022-07-26 for the logs that has messageTmp as Site mapped the following fields:
- Mapped "eventDescription" to "metadata.description".
- Mapped "hostName" to "target.hostname".
- Mapped "machineDomainName" to "target.administrative_domain".
- Mapped "domainName" to "principal.administrative_domain".
- Mapped "serverName" to "principal.hostname".
- Mapped "userName" to "principal.user.userid".
- Mapped "siteName" to "read_only_udm.additional.fields".
2022-05-11 Parsed Event Timestamp log entries with the format "yyyy-MM-dd HH:mm:ss".