Fix logger warnlevel when normalizing request time

[martinalig]

Currently, there is an ERROR logged when the request time exceeds the configured normalized request time in the GaenController exposed and exposedNextDay requests.

This is clearly not an error, so the level should be adjustet to WARN. Also some more information could be printet out, how much too long the request ist actually going.

[ineiti]

This is an error, and is there explicitly to be an error! If the request exceeds the normalized request time, then the normalized request time needs to be increased, else an attacker could learn something about the state of the database.

So the correct solution for this error is to increase the normalized request time.

[ineiti]

See #270

[martinalig]

Closed, as already explained by @ineiti
This is an error as this actually breaks the system from a privacy perspective.