Stop augmenting oslo-incubators default log levels

Thanks to I255a68fc60963386e8fefe65c3ffd269795adbf4, the two modules we
explicitly set log levels for are now in oslo-incubator, so we don't
need the extra code introduced  in
Ib5164a22c5cbfa4f9d881b97bb1f623cd4d2f3f3

Change-Id: Iec7bd35da36135fcaf63a384fa35f849a1319738
Merge "Stop augmenting oslo-incubators default log levels"