Change log for CLOUDGENIX_SDWAN

Date Changes
2022-09-08 Enhancement-
- Added conditional check for PROTOCOL_NAME.
- Added conditional check for MSG if it is similar failure,fail,invalid user,closed,closing set event_type to STATUS_SHUTDOWN.
- Set event_type to NETWORK_FLOW when principal.ip and target.ip not null.
- Set event_type to STATUS_STARTUP when MSG similar to initiating,establishing,establishing,check pass.
- Set event_type to STATUS_UNCATEGORIZED when MSG similar to no such user.
- Added grok pattern for MSG to retrieve dest_ip and Mapped it to target.ip.
- Added grok pattern for the new logs to retrieve ION_HOST.
- Mapped ION_HOST to principal.hostname.