use libnetwork from c/common

The libpod/network packages were moved to c/common so that buildah can
use it as well. To prevent duplication use it in podman as well and
remove it from here.

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

vendor/github.com/containers/common/libnetwork/util/ip.go

@@ -0,0 +1,56 @@
+package util
+
+import (
+	"net"
+)
+
+// IsIPv6 returns true if netIP is IPv6.
+func IsIPv6(netIP net.IP) bool {
+	return netIP != nil && netIP.To4() == nil
+}
+
+// IsIPv4 returns true if netIP is IPv4.
+func IsIPv4(netIP net.IP) bool {
+	return netIP != nil && netIP.To4() != nil
+}
+
+// LastIPInSubnet gets the last IP in a subnet
+func LastIPInSubnet(addr *net.IPNet) (net.IP, error) { //nolint:interfacer
+	// re-parse to ensure clean network address
+	_, cidr, err := net.ParseCIDR(addr.String())
+	if err != nil {
+		return nil, err
+	}
+
+	ones, bits := cidr.Mask.Size()
+	if ones == bits {
+		return cidr.IP, nil
+	}
+	for i := range cidr.IP {
+		cidr.IP[i] |= ^cidr.Mask[i]
+	}
+	return cidr.IP, nil
+}
+
+// FirstIPInSubnet gets the first IP in a subnet
+func FirstIPInSubnet(addr *net.IPNet) (net.IP, error) { //nolint:interfacer
+	// re-parse to ensure clean network address
+	_, cidr, err := net.ParseCIDR(addr.String())
+	if err != nil {
+		return nil, err
+	}
+	ones, bits := cidr.Mask.Size()
+	if ones == bits {
+		return cidr.IP, nil
+	}
+	cidr.IP[len(cidr.IP)-1]++
+	return cidr.IP, nil
+}
+
+// NormalizeIP will transform the given ip to the 4 byte len ipv4 if possible
+func NormalizeIP(ip *net.IP) {
+	ipv4 := ip.To4()
+	if ipv4 != nil {
+		*ip = ipv4
+	}
+}