cubicweb-varnish #17062314 add a category on hook class so that it can be skipped easily [validation pending]

add a category on hook class so that it can be skipped easily

cubicweb's hook control relies on category rather than __regid__

prioritynormal
typebug
done in0.4.0
load left0.000
closed by#cdd802dc156c add a category on hook class so that it can be skipped easily (closes #17062314)
patchadd a category on hook class so that it can be skipped easily (closes #17062314) [applied]