Events cleanup

Otherwise looks good. I hope you haven't smuggled changes into the files while moving them.

And the build is failing. You forgot to update some includes:

zone_events.c:21:30: fatal error: knot/zone/events.h: No such file or directory
 #include "knot/zone/events.h"

I've made a change to the DDNS replaning function - there was no need to lock the lock, since all events must be stopped for both zones.

OK. That's true.

Check the changes out.

mentioned in commit 937c8c

Super awesome! Merged.