api: checkpoint api optimization

[Ace-Tang]

Signed-off-by: Ace-Tang aceapril@126.com

Ⅰ. Describe what this PR did

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how you did it

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[allencloud]

s/exec/checkpoint ?
@Ace-Tang

[allencloud]

Please remove this part.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@a77e0da). Click here to learn what that means.
The diff coverage is 25%.

@@            Coverage Diff            @@
##             master    #2072   +/-   ##
=========================================
  Coverage          ?   63.52%           
=========================================
  Files             ?      207           
  Lines             ?    16122           
  Branches          ?        0           
=========================================
  Hits              ?    10242           
  Misses            ?     4598           
  Partials          ?     1282

Flag	Coverage Δ
#criv1alpha1test	32.73% <0%> (?)
#criv1alpha2test	33.4% <0%> (?)
#integrationtest	37.7% <25%> (?)
#unittest	23.65% <0%> (?)

Impacted Files	Coverage Δ
daemon/mgr/container_checkpoint.go	21.68% <0%> (ø)
apis/server/container_bridge.go	79.69% <80%> (ø)

[allencloud]

LGTM if the CIs are all green.

[allencloud]

I do not think the CI failure is related to the code change
warning: no packages being tested depend on github.com/alibaba/pouch/apis/filters warning: no packages being tested depend on github.com/alibaba/pouch/credential warning: no packages being tested depend on github.com/alibaba/pouch/daemon/events warning: no packages being tested depend on github.com/alibaba/pouch/pkg/term install install bin/pouch /usr/local/bin install bin/pouchd /usr/local/bin download_dependencies hack/install/install_ci_related.sh instsall CI related tools... package golang.org/x/tools/cover: unrecognized import path "golang.org/x/tools/cover" (https fetch: Get https://golang.org/x/tools/cover?go-get=1: dial tcp 74.125.202.141:443: i/o timeout)