cubicweb #1216325 [registry] some events give a self, others do not [open]

e.g:

CW_EVENT_MANAGER.emit('before-registry-reset', self)
CW_EVENT_MANAGER.emit('after-registry-reload')

they probably should all give self

(this is a blocker for the apachekerberos cube)

prioritynormal
typebug
done in<not specified>
load0.200
load left0.200
closed by<not specified>