CLI can show VTEP configurations.

- Can display full configuration info such as connection state.
- Can list all the bindings for a VTEP.

Sample CLI command lines:

>midonet> vtep list
>name TomohikoVTEP0 description BlahBlahBlah0 management-ip 119.15.112.22 management-port 6633 connection-state CONNECTED
>midonet> vtep management-ip 119.15.112.22 list binding
>management-ip 100.100.100.1 port-name port eth0 vlan-id 201 network-id ca07e054-2cef-4b6e-8d0a-c3b8e747615b
>management-ip 100.100.100.2 port-name port eth0 vlan-id 301 network-id 60e94be7-276b-4eec-a845-f16671f01467

Fix MN-1638