feature: pouch info print information enhance

[HusterWan]

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

Ⅰ. Describe what this PR did

1. pretty print pouch info
2. add daemon listen address in info
3. add container count ing info

Ⅱ. Does this pull request fix one issue?

fixes: #920
fix part of #894

Ⅲ. Describe how you did it

Ⅳ. Describe how to verify it

root@osboxes:pouch (zr/info-completion *) -> pouch info
Containers: 1
Running: 1
Paused: 0
Stopped: 0
Images:  0
Server Version: 0.3-dev
Storage Driver:
Driver Status: []
Logging Driver:
Cgroup Driver:
runc: <nil>
containerd: <nil>
Security Options: []
Kernel Version: 3.10.0-693.17.1.el7.x86_64
Operating System:
OSType: linux
Architecture:
HTTP Proxy:
HTTPS Proxy:
Registry: https://index.docker.io/v1/
Experimental: false
Debug: true
Labels: []
CPUs: 0
Total Memory: 0
Name:
ID:
Pouch Root Dir: /var/lib/pouch
LiveRestoreEnabled: false
Daemon Listen Addresses: [unix:///var/run/pouchd.sock]

Ⅴ. Special notes for reviews

[HusterWan]

prettyPrint may not pretty in code style, maybe someone can give me some advice about that.

[codecov-io]

Codecov Report

Merging #941 into master will decrease coverage by 0.1%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #941      +/-   ##
==========================================
- Coverage   13.38%   13.27%   -0.11%     
==========================================
  Files         122      122              
  Lines        8039     8105      +66     
==========================================
  Hits         1076     1076              
- Misses       6867     6933      +66     
  Partials       96       96

Impacted Files	Coverage Δ
cli/info.go	0% <0%> (ø)	⬆️
daemon/mgr/system.go	0% <0%> (ø)	⬆️

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[allencloud]

I think we can use a format template or just manually set the output.
LGTM