feature: memory buffer container io backend

[YaoZengzeng]

Signed-off-by: YaoZengzeng [email protected]

1.Describe what this PR did

Now we only support using http to handle container IO.

With this PR, we could use memory buffer (bytes.Buffer in golang) as another backend type to handle container IO.

2.Does this pull request fix one issue?

3.Describe how you did it

4.Describe how to verify it

5.Special notes for reviews

[codecov-io]

Codecov Report

Merging #625 into master will decrease coverage by 0.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #625      +/-   ##
==========================================
- Coverage   13.36%   13.35%   -0.02%     
==========================================
  Files          65       65              
  Lines        3599     3602       +3     
==========================================
  Hits          481      481              
- Misses       3068     3071       +3     
  Partials       50       50

Impacted Files	Coverage Δ
daemon/mgr/container_types.go	15.87% <ø> (ø)	⬆️
daemon/mgr/container.go	3.79% <0%> (-0.03%)	⬇️

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[allencloud]

Please add more background in PR description, thanks. @YaoZengzeng

[skoowoo]

LGTM

[allencloud]

Actually we wish to know what is the scenario of this feature. For further reason, we encourage specific description which guides others a lot to review code.
Merging this now, maybe next time we could be more strict. 😄