Disable infinite tracing at launch if distributed tracing is disabled

[mfulb]

Currently if infinite tracing is enabled while distributed tracing (DT) is disabled the following warning message will be output:

warning: cannot create a span event when a segment ID cannot be generated; is distributed tracing enabled?

This message can be output multiple times which is not the desired solution.

The proposed solution would be to disable infinite tracing at start up if DT is disabled and output a warning message to this effect. The message would aid troubleshooting settings and would only appear once per agent launch.

The original message can be shifted to a DEBUG log level instead of WARN so it might further aid troubleshooting without impacting normal usage of the agent.