deflake TestRestartMonitor

[AkihiroSuda]

Fix #5146

[theopenlab-ci]

Build succeeded.

• containerd-build-arm64 : SUCCESS in 6m 06s (non-voting)

[AkihiroSuda]

CI failure is unrelated

Run vagrant up --provision-with=selinux,install-runc,test-integration
Bringing machine 'default' up with 'virtualbox' provider...
==> default: Checking if box 'fedora/33-cloud-base' version '33.20201019.0' is up to date...
==> default: Running provisioner: install-runc (shell)...
    default: Running: inline script
    default: /tmp/vagrant-install-runc: line 5: GOPATH: unbound variable

https://github.com/containerd/containerd/pull/5157/checks?check_run_id=2083879992

[k8s-ci-robot]

@AkihiroSuda: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
pull-containerd-node-e2e	ee84e85	link	/test pull-containerd-node-e2e

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[Zyqsempai]

LGTM

[estesp]

LGTM