feature: add volume drivers info for system info

[shaloulcy]

feature: add volume drivers info for system info

Signed-off-by: Eric Li lcy041536@gmail.com

Ⅰ. Describe what this PR did

add volume drivers info when return system info

Ⅱ. Does this pull request fix one issue?

NONE

Ⅲ. Describe how you did it

Ⅳ. Describe how to verify it

~# pouch info
Containers: 17
 Running: 2
 Paused: 0
 Stopped: 15
Images:  4
ID: 
Name: ubuntu-1
Server Version: 0.4.0
Storage Driver: overlayfs
Driver Status: []
Logging Driver: 
Volume Drivers: [local-persist ceph tmpfs local]
Cgroup Driver: 
runc: <nil>
containerd: <nil>
Security Options: []
Kernel Version: 4.4.0-116-generic
Operating System: "Ubuntu 16.04.4 LTS"
OSType: linux
Architecture: amd64
HTTP Proxy: 
HTTPS Proxy: 
Registry: https://index.docker.io/v1/
Experimental: false
Debug: true
Labels:
  node_ip=127.0.1.1
  SN=0
CPUs: 1
Total Memory: 3.859 GiB
Pouch Root Dir: /var/lib/pouch
LiveRestoreEnabled: true
LxcfsEnabled: false
Daemon Listen Addresses: [unix:///var/run/pouchd.sock]

Ⅴ. Special notes for reviews

[rudyfly]

Could you add cli test for pouch info？

[codecov-io]

Codecov Report

Merging #1352 into master will decrease coverage by 0.02%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #1352      +/-   ##
==========================================
- Coverage   17.34%   17.31%   -0.03%     
==========================================
  Files         189      189              
  Lines       11829    11826       -3     
==========================================
- Hits         2052     2048       -4     
- Misses       9630     9631       +1     
  Partials      147      147

Impacted Files	Coverage Δ
cli/info.go	0% <0%> (ø)	⬆️
daemon/mgr/system.go	0% <0%> (ø)	⬆️
daemon/mgr/image_store.go	80.7% <0%> (-0.66%)	⬇️
cri/src/cri.go	0% <0%> (ø)	⬆️
daemon/mgr/container.go	0% <0%> (ø)	⬆️
daemon/mgr/image.go	0% <0%> (ø)	⬆️

[shaloulcy]

@rudyfly pouch info has too many informations related pouchd daemon and host. So it's not easy for ci test

[allencloud]

pouch info has too many informations related pouchd daemon and host. So it's not easy for ci test

You could this part testing in test/api_system_test.go. @shaloulcy

[shaloulcy]

@rudyfly @allencloud Fine! I have added ci test for this feature

[rudyfly]

LGTM