Kubernetes Flannel Networking

issue1

```
kubectl logs kube-flannel-ds-arm-hkpl7 -n kube-system
I1228 19:29:02.922025       1 main.go:514] Determining IP address of default interface
I1228 19:29:02.922746       1 main.go:527] Using interface with name wlan0 and address 192.168.0.223
I1228 19:29:02.922794       1 main.go:544] Defaulting external address to interface address (192.168.0.223)
I1228 19:29:03.058544       1 kube.go:126] Waiting 10m0s for node controller to sync
I1228 19:29:03.058661       1 kube.go:309] Starting kube subnet manager
I1228 19:29:04.058923       1 kube.go:133] Node controller sync successful
I1228 19:29:04.059064       1 main.go:244] Created subnet manager: Kubernetes Subnet Manager - raspberrypi-2
I1228 19:29:04.059129       1 main.go:247] Installing signal handlers
I1228 19:29:04.059926       1 main.go:386] Found network config - Backend type: vxlan
I1228 19:29:04.060134       1 vxlan.go:120] VXLAN config: VNI=1 Port=0 GBP=false DirectRouting=false
E1228 19:29:04.061713       1 main.go:289] Error registering network: failed to configure interface flannel.1: failed to ensure address of interface flannel.1: link has incompatible addresses. Remove additional addresses and try again. &netlink.Vxlan{LinkAttrs:netlink.LinkAttrs{Index:5, MTU:1450, TxQLen:0, Name:"flannel.1", HardwareAddr:net.HardwareAddr{0x16, 0x37, 0xb2, 0xe2, 0x58, 0xc3}, Flags:0x13, RawFlags:0x11043, ParentIndex:0, MasterIndex:0, Namespace:interface {}(nil), Alias:"", Statistics:(*netlink.LinkStatistics)(0x12461104), Promisc:0, Xdp:(*netlink.LinkXdp)(0x122bd110), EncapType:"ether", Protinfo:(*netlink.Protinfo)(nil), OperState:0x0}, VxlanId:1, VtepDevIndex:3, SrcAddr:net.IP{0xc0, 0xa8, 0x0, 0xdf}, Group:net.IP(nil), TTL:0, TOS:0, Learning:false, Proxy:false, RSC:false, L2miss:false, L3miss:false, UDPCSum:true, NoAge:false, GBP:false, Age:300, Limit:0, Port:8472, PortLow:0, PortHigh:0}
I1228 19:29:04.061847       1 main.go:366] Stopping shutdownHandler...
```
fixed by executing the following command in affected nodes

```
sudo ip link delete flannel.1
```