Change log for SOURCEFIRE_IDS

Date Changes
2022-06-09 Bug - Parsed logs of kv format (FTD)
Mapped following fields-
"sourceHostname" to "principal.hostname".
"DstIP" to "target.ip".
"SrcIP" to "principal.ip".
"DstPort" to "target.port".
"SrcPort" to "principal.port".
"Protocol" to "network.ip_protocol".
"InitiatorBytes" to "network.sent_bytes".
"ResponderBytes" to "network.received_bytes".
"NAPPolicy" to "security_result.description".
"EventPriority" to "security_result.severity".
"AccessControlRuleName" to "security_result.rule_name".
"ACPolicy" to "principal.resource.name".
"ACCESS_POLICY" to "principal.resource.resource_type".
"event_type" according to log values.