bugfix: not save ExecIds to meta.json file

[HusterWan]

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

Ⅰ. Describe what this PR did

The ExecIds are all stored in memory, so we no need to store them to the container meta.json file.

Ⅱ. Does this pull request fix one issue?

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

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov]

Codecov Report

Merging #2777 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2777      +/-   ##
==========================================
+ Coverage   69.32%   69.34%   +0.01%     
==========================================
  Files         277      277              
  Lines       17425    17425              
==========================================
+ Hits        12080    12083       +3     
+ Misses       4019     4011       -8     
- Partials     1326     1331       +5

Flag	Coverage Δ
#criv1alpha2_test	39.38% <ø> (+0.03%)	⬆️
#integration_test_0	36.56% <ø> (-0.03%)	⬇️
#integration_test_1	35.75% <ø> (ø)	⬆️
#integration_test_2	36.55% <ø> (+0.03%)	⬆️
#integration_test_3	35.47% <ø> (ø)	⬆️
#node_e2e_test	35.3% <ø> (+0.01%)	⬆️
#unittest	28.53% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
daemon/mgr/container_types.go	72.85% <ø> (ø)	⬆️
pkg/meta/store.go	67.44% <0%> (-1.56%)	⬇️
daemon/mgr/container_utils.go	81.81% <0%> (-1.14%)	⬇️
ctrd/container.go	56.02% <0%> (+0.19%)	⬆️
pkg/streams/utils.go	89.28% <0%> (+7.14%)	⬆️

[fuweid]

LGTM