cni network configs set ipv6 enables correctly

When configs are loaded from disk we need to check if they contain a
ipv6 subnet and set ipv6 enables to true in this case.

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

libpod/network/cni/cni_conversion.go

@@ -185,6 +185,9 @@ func convertIPAMConfToNetwork(network *types.Network, ipam ipamConfig, confPath
 				s.LeaseRange.StartIP = rangeStart
 				s.LeaseRange.EndIP = rangeEnd
 			}
+			if util.IsIPv6(s.Subnet.IP) {
+				network.IPv6Enabled = true
+			}
 			network.Subnets = append(network.Subnets, s)
 		}
 	}

libpod/network/cni/config_test.go

@@ -313,6 +313,14 @@ var _ = Describe("Config", func() {
 			Expect(network1.Subnets[0].Subnet.String()).To(Equal(subnet))
 			Expect(network1.Subnets[0].Gateway.String()).To(Equal("fdcc::1"))
 			Expect(network1.Subnets[0].LeaseRange).To(BeNil())
+
+			// reload configs from disk
+			libpodNet, err = getNetworkInterface(cniConfDir, false)
+			Expect(err).To(BeNil())
+			// check the the networks are identical
+			network2, err := libpodNet.NetworkInspect(network1.Name)
+			Expect(err).To(BeNil())
+			Expect(network1).To(Equal(network2))
 		})
 
 		It("create bridge with ipv6 enabled", func() {