**Summary**
Add op-mode command for VLAN-to-VNI mappings
The command would show the information from:
```
bridge vlan tunnelshow dev <vxlan interface>
```
The output will look like this:
#####Normal:
```
Interface VLAN VNI Description
----------- ------ ----- ---------------
vxlan1 10 1001 Cust-A
vxlan1 20 1002 Cust-B
```
#####Detailed:
```
-----------------------------------
Interface: vxlan1
VLAN | 10
VNI | 1001
Description | Cust-A
Rx Bytes | 0
Tx Bytes | 0
Rx Packets | 0
Tx Packets | 0
VLAN | 20
VNI | 1002
Description | Cust-B
Rx Bytes | 0
Tx Bytes | 0
Rx Packets | 0
Tx Packets | 0
```