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 1 vlan-id 1 network-id ca07e054-2cef-4b6e-8d0a-c3b8e747615b
management-ip 100.100.100.2 port-name port 2 vlan-id 2 network-id 60e94be7-276b-4eec-a845-f16671f01467

Fix MN-1638