EndpointID isn't valid in Network Inspect

[sflxn]

If we execute docker network inspect, the EndpointID listed is actually the ID of the container. That doesn't appear right. Below is an example output:

loc@ubuntu:~/go/src/github.com/vmware/vic$ docker network inspect bridge
[
    {
        "Name": "bridge",
        "Id": "3622e8f3cb80450b6610ae9e04905047fe94d7de21b8180539edfaa7e57f4b74",
        "Scope": "",
        "Driver": "bridge",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "",
            "Options": {},
            "Config": [
                {
                    "Subnet": "172.16.0.0/16",
                    "Gateway": "172.16.0.1"
                }
            ]
        },
        "Internal": false,
        "Containers": {
            "81bee217730745383e77a683b2ef7f6d01e3e9d33fcd72266bc31270b8015c32": {
                "Name": "modest_wilson",
                "EndpointID": "81bee217730745383e77a683b2ef7f6d01e3e9d33fcd72266bc31270b8015c32",
                "MacAddress": "",
                "IPv4Address": "172.16.0.2/16",
                "IPv6Address": ""
            }
        },
        "Options": {},
        "Labels": {}
    }
]

[hmahmood]

Acceptance:

• verify that endpoint id not the same as the container id and is unique per endpoint

[corrieb]

Confirmed this is still a bug and is easy to reproduce. Can't be a difficult fix.

[hickeng]

This is not recreating while looking at #8052