Reduce log output for skosmos-*

**Is your feature request related to a problem? Please describe.**
The logs for skosmos contains per default all accesses. This might result in gigantic log files.
In the meantime the logs for (*-dev) are redirected to /dev/null which is not the best solution.
(See branch 'reduceLogOutput4SkosmosAndFusekiDev')

**Describe the solution you'd like**
It would be nice if only accesses with an HTTP status greater than 299 would be logged.

Start by locating the logging configuration for skosmos-* and the (*-dev) output redirected to /dev/null; the issue mentions the branch reduceLogOutput4SkosmosAndFusekiDev as related context. Done means successful accesses are no longer logged by default, while accesses with HTTP status greater than 299 remain logged.

Written by the indexing model from the issue text.