feature: add snapshotter info into container json

[HusterWan]

Signed-off-by: Michael Wan zirenwan@gmail.com

Ⅰ. Describe what this PR did

add snapshotter info into container json

since graphdriver has been replace by snapshotter, so i also rename the GraphDriver to Snapshotter in pouch

Ⅱ. Does this pull request fix one issue?

fixes #1011

root@osboxes:wanziren -> pouch inspect -f "{{.GraphDriver.Data.UpperDir}}" test
/var/lib/pouch/containerd/root/io.containerd.snapshotter.v1.overlayfs/snapshots/1809/fs

Ⅲ. Describe how you did it

Ⅳ. Describe how to verify it

now we has snapshotter info in container json

        "Snapshotter": {
            "Data": {
                "MergedDir": "/var/lib/pouch/containerd/state/io.containerd.runtime.v1.linux/default/6933c23039432c5a1b1f88c6d94c39fe8fd88943121ac7af419b2c42a2e440fe/rootfs",
                "UpperDir": "/var/lib/pouch/containerd/root/io.containerd.snapshotter.v1.overlayfs/snapshots/1809/fs"
            },
            "Name": "overlayfs"
        },

root@osboxes:wanziren -> pouch inspect test
[
    {
        "Args": null,
        "Config": {
            "Cmd": [
                "sh"
            ],
            "Entrypoint": null,
            "Env": [
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
            ],
            "Image": "registry.hub.docker.com/library/busybox:latest",
            "OnBuild": null,
            "Shell": null
        },
        "Created": "2018-04-15T17:01:17.359541477Z",
        "GraphDriver": {
            "Data": {
                "MergedDir": "/var/lib/pouch/containerd/state/io.containerd.runtime.v1.linux/default/6933c23039432c5a1b1f88c6d94c39fe8fd88943121ac7af419b2c42a2e440fe/rootfs",
                "UpperDir": "/var/lib/pouch/containerd/root/io.containerd.snapshotter.v1.overlayfs/snapshots/1809/fs"
            },
            "Name": "overlayfs"
        },
        "HostConfig": {
            "NetworkMode": "bridge",
            "OomScoreAdj": -500,
            "RestartPolicy": {
                "Name": "no"
            },
            "Runtime": "runc",
            "BlkioDeviceReadBps": null,
            "BlkioDeviceReadIOps": null,
            "BlkioDeviceWriteBps": null,
            "BlkioDeviceWriteIOps": null,
            "BlkioWeightDevice": null,
            "CgroupParent": "default",
            "DeviceCgroupRules": null,
            "Devices": [],
            "MemoryExtra": 0,
            "MemorySwappiness": -1,
            "MemoryWmarkRatio": 0,
            "OomKillDisable": false,
            "Ulimits": null
        },
        "Id": "6933c23039432c5a1b1f88c6d94c39fe8fd88943121ac7af419b2c42a2e440fe",
        "Image": "registry.hub.docker.com/library/busybox:latest",
        "Mounts": [],
        "Name": "test",
        "NetworkSettings": {
            "Networks": {
                "bridge": {
                    "Aliases": null,
                    "EndpointID": "58889c2650a2051fc2ad76d44d1e0fe54044bf043a38f4b74104c4f5c14cde1f",
                    "Gateway": "172.17.0.1",
                    "IPAddress": "172.17.0.2",
                    "IPPrefixLen": 24,
                    "Links": null,
                    "MacAddress": "02:42:ac:11:00:02",
                    "NetworkID": "3f31a4ebae28cb6ec7dbe6950ae736929ee9dac611a49a7d369b8b8bcdfb5e6c"
                }
            },
            "SecondaryIPAddresses": null,
            "SecondaryIPv6Addresses": null
        },
        "Snapshotter": {
            "Data": {
                "MergedDir": "/var/lib/pouch/containerd/state/io.containerd.runtime.v1.linux/default/6933c23039432c5a1b1f88c6d94c39fe8fd88943121ac7af419b2c42a2e440fe/rootfs",
                "UpperDir": "/var/lib/pouch/containerd/root/io.containerd.snapshotter.v1.overlayfs/snapshots/1809/fs"
            },
            "Name": "overlayfs"
        },
        "State": {
            "Pid": 10364,
            "StartedAt": "2018-04-15T17:01:17.71750248Z",
            "Status": "running"
        }
    }
]

Ⅴ. Special notes for reviews

[HusterWan]

In fact, i am not sure whether this PR match your requirement, @yyb196 can you pls review this PR and give me some advice?

[allencloud]

I am wondering if removing GraphDriver is reasonable, since it will break the compatibility of API. WDYT? @yyb196

[codecov-io]

Codecov Report

Merging #1130 into master will decrease coverage by <.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #1130      +/-   ##
==========================================
- Coverage   15.62%   15.61%   -0.01%     
==========================================
  Files         172      172              
  Lines        9672     9674       +2     
==========================================
  Hits         1511     1511              
- Misses       8052     8054       +2     
  Partials      109      109

Impacted Files	Coverage Δ
daemon/mgr/container_types.go	15.38% <ø> (ø)	⬆️
apis/server/container_bridge.go	0% <0%> (ø)	⬆️
daemon/mgr/container.go	4.89% <0%> (-0.09%)	⬇️
ctrd/snapshot.go	0% <0%> (ø)	⬆️
client/client.go	20% <0%> (-8%)	⬇️
ctrd/image.go	0% <0%> (ø)	⬆️
daemon/mgr/cri.go	0% <0%> (ø)	⬆️
pkg/kernel/kernel.go	72.72% <0%> (+22.72%)	⬆️

[allencloud]

LGTM