Incorrect interface names in vl3 example

[VitalyGushin]

Steps to reproduce: Deploy vl3-basic example.

NSM API returns 5 connections.

Issues:

• The server side MEMIF interface name is incorrect (metrics:{key:\“server_interface\” value:\“MEMIF/\“})
• In looped endpoint1-endpoint1 connections, the first (KERNEL) interface does not have a name
• In inter-node endpoint1-endpoint2 connections, the client endpoint does not contain an interface name

Path example:

path_segments:{name:\“nse-vl3-vpp-54d5d7468c-9ln7f\“}
path_segments:{name:\“nsmgr-j6x6m\“}
path_segments:{name:\“forwarder-vpp-zpg6b\”
	metrics:{key:\“client_interface\” value:\“MEMIF/memif1649599747/0\“}
	metrics:{key:\“server_interface\” value:\“VIRTIO/tun0\“}}
path_segments:{name:\“nse-vl3-vpp-54d5d7468c-9ln7f\”
	metrics:{key:\“server_interface\” value:\“MEMIF/\“}}}

Dashboard canvas example: