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".