Automatic merge from submit-queue (batch tested with PRs 51038, 50063, 51257, 47171, 51143)
Add signal handler for catching Ctrl-C on hack/e2e
**What this PR does / why we need it**:
When operating e2e test, hack/e2e.go process creates kubetest process.
To kill the kubetest process when stop e2e test with Ctrl-C, we need
to send the signal to the process because it also creates another
process and it needs to kill it.
This PR adds the signal handler on hack/e2e.go to kill the kubetest
process.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
fixes#43051
**Special notes for your reviewer**:
https://github.com/kubernetes/test-infra/pull/4154 is the part of kubetest.
**Release note**:
`NONE`
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