kvm2 driver: add static ip

Author: prezha

Diff for: pkg/network/network.go

@@ -264,37 +264,3 @@ func reserveSubnet(subnet string, period time.Duration) bool {
 	reservedSubnets.Store(subnet, reservation{createdAt: time.Now()})
 	return true
 }
-
-// IncIP returns address calculated by adding (positive or negative) val to addr.
-// If addr is not in CIDR format it will use its default mask and set "out-of-network" if calculated address doesn't belong to same network as addr.
-func IncIP(addr string, val int) (calc string, oon bool, err error) {
-	ip, network, err := net.ParseCIDR(addr)
-	if err != nil { // addr not in CIDR format - use default mask for IP addr
-		ip = net.ParseIP(addr)
-		if ip == nil {
-			return "", false, fmt.Errorf("failed parsing address %s: %w", addr, err)
-		}
-		prefix, _ := ip.DefaultMask().Size() // assume default network mask
-		_, network, err = net.ParseCIDR(fmt.Sprintf("%s/%d", addr, prefix))
-		if err != nil {
-			return "", false, fmt.Errorf("failed parsing CIDR %s/%d: %w", addr, prefix, err)
-		}
-	}
-
-	ip0 := ip.To4() // convert to 4-byte representation
-	n0 := binary.BigEndian.Uint32(ip0)
-
-	n1 := int(n0) + val
-	if n1 < 0 {
-		return "", true, fmt.Errorf("failed decrementing IP %s: value %d too big", addr, val)
-	}
-
-	ip1 := make(net.IP, 4)
-	binary.BigEndian.PutUint32(ip1, uint32(n1))
-
-	if !network.Contains(ip1) {
-		return "", true, fmt.Errorf("failed incrementing IP %s: value %d too big (%s would cross network boundary)", addr, val, ip)
-	}
-
-	return ip1.String(), false, nil
-}