refactor: move pkg to correct places

[allencloud]

Signed-off-by: Allen Sun allensun.shl@alibaba-inc.com

Ⅰ. Describe what this PR did

When I am learning the structure of package pkg, I find that there are at least three packages which should be moved out of it:

• client
• quota
• runconfig

Here is my reason:
we usually keep totally general packages in package pkg, while three packages above are something specific, client is for control server or something like that, quota for filesystem quota for container, and runconfig is for pouch container's some kind of config parameter.

I wish we could add a folder which is named storage, then some structure may be like:

storage:
     \___volume
      \__quota
       \_ controlserver
                 \_client

Actually I am afraid the package name of client is not my dishes. Like the code makes me feel confused:

return client.JoinURL(c.BaseURL, types.APIVersion, client.StoragePath)

Here, I think client is a struct instance, however it is a package. So hard to understand and quite awkward.

Ⅱ. Does this pull request fix one issue?

fix #1051

Ⅲ. Describe how you did it

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-io]

Codecov Report

Merging #1147 into master will increase coverage by 0.38%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1147      +/-   ##
==========================================
+ Coverage   15.19%   15.58%   +0.38%     
==========================================
  Files         173      173              
  Lines        9705     9817     +112     
==========================================
+ Hits         1475     1530      +55     
- Misses       8125     8178      +53     
- Partials      105      109       +4

Impacted Files	Coverage Δ
apis/opts/memory_swappiness.go	100% <ø> (ø)
apis/opts/cpu.go	0% <ø> (ø)
daemon/mgr/container.go	0% <ø> (ø)	⬆️
apis/opts/devicemappings.go	95.55% <ø> (ø)
daemon/mgr/spec_devices.go	0% <ø> (ø)	⬆️
apis/opts/oom_score.go	0% <ø> (ø)
apis/opts/spec_annotation.go	60% <ø> (ø)
apis/opts/mountpoint.go	84.61% <ø> (ø)
cli/update.go	0% <ø> (ø)	⬆️
storage/controlserver/client/httpcli.go	0% <ø> (ø)
... and 21 more

[rudyfly]

LGTM