Implement a runtime changeable rule that matches IP address for a certain time.

Implement a runtime changeable rule that matches IP address for a certain time.
This effectively allows (for example) pool selection from Lua, but then cached.

Sample code:

```
newServer({address="192.168.1.20", pool=""})
newServer({address="8.8.8.8", pool="elgoog"})

tisrElGoog=TimedIPSetRule()
tisrRest=TimedIPSetRule()
addAction(tisrElGoog:slice(), PoolAction("elgoog"))
addAction(tisrRest:slice(), PoolAction(""))

elgoogPeople=newNMG()
elgoogPeople:addMask("192.168.1.0/28")

function pickPool(dq)
	if(elgoogPeople:match(dq.remoteaddr)) -- in real life, this would be external
	then
		print("Lua caught query for a googlePerson")
		tisrElGoog:add(dq.remoteaddr, 10)
		return DNSAction.Pool, "elgoog"
	else
		print("Lua caught query for restPerson")
		tisrRest:add(dq.remoteaddr, 60)
		return DNSAction.None, ""
	end
end

addLuaAction(AllRule(), pickPool)
```