Change log for SYMANTEC_VIP

Date Changes
2023-03-03 Enhancement- Mapped "userid" to "target.user.userid" for the logs that were not parsed already.
- Mapped "event_type" to "USER_LOGIN" for the logs where "userid" is present
else if "principal.hostname" is present then mapped "event_type" to "STATUS_UPDATE",
else mapped it to "GENERIC_EVENT".
- Parsed the logs that were dropped initially.
2022-08-03 BugFix - Added the grok pattern to handle the unparsed logs having log_type "remove_credentials".