panic when multiple goroutine concurrency access same map

[Yellow-L]

What type of PR is this?

/kind bug
What type of PR is this?

What this PR does / why we need it:
panic when multiple goroutine concurrency access same map

Which issue(s) this PR fixes:
Fixes #2036

Special notes for your reviewer:
N/A

[kubeedge-bot]

Welcome @Yellow-L! It looks like this is your first PR to kubeedge/kubeedge 🎉

[luogangyi]

is it better to use sync.Map instead of manually add lock?

[Yellow-L]

@luogangyi yes, you're right, i'll change from it to sync.map.

[fisherxu]

@Yellow-L Please fix the ci issue :) Need run make lint in your host

[fisherxu]

/lgtm
/approve
Thanks for the fixing :)

[kubeedge-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fisherxu

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[Yellow-L]

@fisherxu :)

[fisherxu]

@Yellow-L Would you like to cherry-pick the PR to release-1.4 branch throuch hack/cherry-pick_pull.sh script? So we can release it in 1.4.

[Yellow-L]

@fisherxu yes, no problem.