+1720. [func]* tomek
+ The next step status in pkt4_send hook point now is able to
+ distinguish between SKIP (Kea will skip packing the packet with
+ the assumption that a hook already did that) and DROP (Kea will
+ drop the packet). Previously both SKIP and DROP were interpreted
+ as skip packing.
+ (Gitlab #1090)
+
1719. [func] razvan
Prepared CalloutManager to be used in multi-threading by moving
the current library index and hook index to the CallbackHandle.