BUG/MINOR: rules: Return ACT_RET_ABRT when a silent-drop action is executed

When an action interrupts a transaction, returning a response or not, it must
return the ACT_RET_ABRT value and not ACT_RET_STOP. ACT_RET_STOP is reserved to
stop the processing of the current ruleset.

No backport needed because on previous versions, the action return values are
not handled the same way.
1 file changed