Add node routes crash bug when configure TransportInterface

[Jexf]

bug 1

Add node routes crash bug when configure TransportInterface

I0827 11:26:12.507565       1 client.go:130] Updating Antrea client with the new CA bundle
E0827 11:26:12.511804       1 runtime.go:78] Observed a panic: "invalid memory address or nil pointer dereference" (runtime error: invalid memory address or nil pointer dereference)
goroutine 399 [running]:
k8s.io/apimachinery/pkg/util/runtime.logPanic(0x21c8400, 0x37f9270)
	/root/go/pkg/mod/k8s.io/apimachinery@v0.21.0/pkg/util/runtime/runtime.go:74 +0x95
k8s.io/apimachinery/pkg/util/runtime.HandleCrash(0x0, 0x0, 0x0)
	/root/go/pkg/mod/k8s.io/apimachinery@v0.21.0/pkg/util/runtime/runtime.go:48 +0x89
panic(0x21c8400, 0x37f9270)
	/opt/go/src/runtime/panic.go:969 +0x1b9
antrea.io/antrea/pkg/agent/controller/noderoute.(*Controller).getNodeTransportAddrs(0xc000177d40, 0xc0001b8300, 0x6, 0x6, 0x0)
	/root/showmaker/antrea/pkg/agent/controller/noderoute/node_route_controller.go:754 +0x17f
antrea.io/antrea/pkg/agent/controller/noderoute.(*Controller).addNodeRoute(0xc000177d40, 0xc000ad4820, 0x6, 0xc0001b8300, 0x0, 0x0)
	/root/showmaker/antrea/pkg/agent/controller/noderoute/node_route_controller.go:457 +0x187
antrea.io/antrea/pkg/agent/controller/noderoute.(*Controller).syncNodeRoute(0xc000177d40, 0xc000ad4820, 0x6, 0x0, 0x0)
	/root/showmaker/antrea/pkg/agent/controller/noderoute/node_route_controller.go:406 +0x16c
antrea.io/antrea/pkg/agent/controller/noderoute.(*Controller).processNextWorkItem(0xc000177d40, 0x203000)
	/root/showmaker/antrea/pkg/agent/controller/noderoute/node_route_controller.go:371 +0x106
antrea.io/antrea/pkg/agent/controller/noderoute.(*Controller).worker(0xc000177d40)
	/root/showmaker/antrea/pkg/agent/controller/noderoute/node_route_controller.go:342 +0x2b
k8s.io/apimachinery/pkg/util/wait.BackoffUntil.func1(0xc000278530)
	/root/go/pkg/mod/k8s.io/apimachinery@v0.21.0/pkg/util/wait/wait.go:155 +0x5f
k8s.io/apimachinery/pkg/util/wait.BackoffUntil(0xc000278530, 0x27f7700, 0xc0007bf410, 0x1, 0xc0000aaf60)
	/root/go/pkg/mod/k8s.io/apimachinery@v0.21.0/pkg/util/wait/wait.go:156 +0xad
k8s.io/apimachinery/pkg/util/wait.JitterUntil(0xc000278530, 0x3b9aca00, 0x0, 0x1, 0xc0000aaf60)
	/root/go/pkg/mod/k8s.io/apimachinery@v0.21.0/pkg/util/wait/wait.go:133 +0x98
k8s.io/apimachinery/pkg/util/wait.Until(0xc000278530, 0x3b9aca00, 0xc0000aaf60)
	/root/go/pkg/mod/k8s.io/apimachinery@v0.21.0/pkg/util/wait/wait.go:90 +0x4d
created by antrea.io/antrea/pkg/agent/controller/noderoute.(*Controller).Run
	/root/showmaker/antrea/pkg/agent/controller/noderoute/node_route_controller.go:334 +0x285
E0827 11:26:12.511884       1 runtime.go:78] Observed a panic: "invalid memory address or nil pointer dereference" (runtime error: invalid memory address or nil pointer dereference)

func (c *Controller) getNodeTransportAddrs(node *corev1.Node) (*utilip.DualStackIPs, error) {
	var transportAddrs *utilip.DualStackIPs
          ...
}

The var transportAddrs *utilip.DualStackIPs param is uninitialized

bug 2

I0827 12:00:24.034806       1 agent.go:313] Agent initialized NodeConfig=NodeName: tos-05, OVSBridge: br-int, PodIPv4CIDR: 10.224.2.0/24, PodIPv6CIDR: <nil>, NodeIPv4: 172.18.123.16/22, NodeIPv6: <nil>, TransportIPv4: <nil>, TransportIPv6: 172.18.123.16/22, Gateway: Name antrea-gw0: IPv4 10.224.2.1, IPv6 <nil>, MAC de:3e:a1:ca:b1:ac, NetworkConfig=&{Encap geneve None  eth1 192.168.121.0/24}

ransportIPv4: <nil>, TransportIPv6: 172.18.123.16/22 ipv4 address and ipv6 address are confused:

	for _, addr := range addrList {
		if ipNet, ok := addr.(*net.IPNet); ok {
			if ipNet.IP.IsGlobalUnicast() {
				if ipNet.IP.To4() != nil {
					v6IPNet = ipNet
				} else {
					v4IPNet = ipNet
				}
			}
		}
	}