Remove/Make Optional the message that gets printed when ignoreSslErrors = true

[mlfreeman2]

I have a test install running at work and noticed something: even with ignoreSslErrors=true in my config a message is being printed to NLog internal logging.

I figure that if I'm not interested in SSL errors, nothing should be printed to NLog's internal log.

It seems to be coming from this line.

NLog.Targets.Splunk/src/NLog.Targets.Splunk/Splunk.Logging.Common/HttpEventCollectorSender.cs

Line 599 in fb14598

OnError(new HttpEventCollectorException(HttpStatusCode.NotAcceptable, reply: warning));

Perhaps you could refactor this into a warnOnSslErrors boolean as a separate option, or maybe turn the ignore boolean into an enum ("yes", "no", "warn").