bugfix: we should get a container's execids from inspect

[HusterWan]

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

Ⅰ. Describe what this PR did

Now we cannot get a container's execids from inspect interface, So I opened this pull request tries to fix this problem. Now we can get the execids:

#  pouch inspect -f {{.ExecIds}} b63f88
[27573dc84a363456df62ac26a6258536c8c989a87bf9cbbe95c0adf9619f1c36]

But this solution has a problem, the execids of container's memory data or meta.json file may be incorrect, because we only update a container's execids when we call Get Container API.

So we can ensure the API's data is correct, but the data in memory or file may incorrect, this solution may not be best, we can discuss it. How about extend the interface:

// before
Get(ctx context.Context, name string) (*Container, error)

// after changed, execids not stored in ContainerJSON, but by api interface
Get(ctx context.Context, name string) (*Container, []string, error)

Ⅱ. Does this pull request fix one issue?

fixes: #2697

Ⅲ. Why don't you add test cases (unit test/integration test)? (你真的觉得不需要加测试吗？)

add unit test TestSafeMapValues
add an integration test TestContainerInspectExecIds

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov]

Codecov Report

Merging #2699 into master will increase coverage by 1.18%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2699      +/-   ##
==========================================
+ Coverage   67.53%   68.72%   +1.18%     
==========================================
  Files         278      278              
  Lines       17409    17593     +184     
==========================================
+ Hits        11758    12090     +332     
+ Misses       4330     4176     -154     
- Partials     1321     1327       +6

Flag	Coverage Δ
#criv1alpha2_test	39.27% <56.25%> (ø)	⬆️
#integration_test_0	36.35% <100%> (+0.05%)	⬆️
#integration_test_1	35.28% <81.25%> (+0.06%)	⬆️
#integration_test_2	36.38% <100%> (?)
#integration_test_3	35.2% <81.25%> (+0.07%)	⬆️
#node_e2e_test	35.04% <93.75%> (ø)	⬆️
#unittest	27.42% <18.75%> (-0.01%)	⬇️

Impacted Files	Coverage Δ
daemon/mgr/container_types.go	72.85% <ø> (ø)	⬆️
pkg/collect/safe_map.go	100% <100%> (ø)	⬆️
daemon/mgr/container.go	59.7% <100%> (+1.09%)	⬆️
apis/server/container_bridge.go	90.44% <100%> (+1.71%)	⬆️
daemon/mgr/events.go	85.43% <0%> (-14.57%)	⬇️
cri/ocicni/cni_manager.go	58.82% <0%> (-11.77%)	⬇️
cri/v1alpha2/cri_utils.go	76.79% <0%> (-11.32%)	⬇️
pkg/streams/utils.go	82.14% <0%> (-9.53%)	⬇️
daemon/mgr/container_state.go	89.71% <0%> (-1.77%)	⬇️
cri/v1alpha2/cri.go	71.28% <0%> (-0.65%)	⬇️
... and 32 more

[fuweid]

LGTM