integration: custom etcd gracefully termination

[aojea]

when running integration tests without an external etcd, the framework
spawns an etcd instance executing it in its own process and killing
it once the test stops.

Instead of killing it directly, allow etcd to exit gracefully or kill
it after 5 seconds.

/kind cleanup

NONE

Before this patch:

go test -timeout 100s -run ^TestLivezAndReadyz$ k8s.io/kubernetes/test/integration/controlplane -v -count 1
...
I0210 15:46:15.195847 1877999 etcd.go:133] etcd exit status: signal: killed

After this patch:

I0210 15:48:35.992339 1880623 etcd.go:142] etcd exit status: signal: terminated

[aojea]

/assign @pohly @liggitt @BenTheElder

[aojea]

I think that this is mostly cosmetic to reduce noise in the logs if you use go test

[aojea]

/retest

[aojea]

this is not a big deal, the job doesn't use this codepath, but implements a "more" correct behavior and I think we can have it for people that runs their tests locally

[oomichi]

/lgtm

[liggitt]

/lgtm
/approve
/retest

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aojea, liggitt

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/retest