cubicweb-celerytask #15772832 Make it easier to override log level [validation pending]

Using a class attribute instead of a hard-coded value

prioritynormal
typeenhancement
done in0.2.0
load left0.000
closed by#4c7672eeb7f0 Make it easier to override default log level of the log table
patchMake it easier to override default log level of the log table [applied]