entrypoint: forward the signal we were sent
entrypoint: forward the signal we were sent

We listen for SIGTERM and SIGINT, but would always send SIGINT to the
child process regardless of what we got. This change is
backwards-compatible in that we still send SIGINT in all cases, but we
will furthermore send the signal we got where possible.

Signed-off-by: Steve Kuznetsov <a7da0fca91d9933d2725d731a48cabdc9e8ffd7a@redhat.com>

dims/test-infra,cjwagner/test-infra,fejta/test-infra,cjwagner/test-infra,cblecker/test-infra,pwittrock/test-infra,jessfraz/test-infra,fejta/test-infra,monopole/test-infra,fejta/test-infra,kubernetes/test-infra,cblecker/test-infra,BenTheElder/test-infra,dims/test-infra,cblecker/test-infra,BenTheElder/test-infra,cjwagner/test-infra,kubernetes/test-infra,kubernetes/test-infra,monopole/test-infra,cblecker/test-infra,dims/test-infra,BenTheElder/test-infra,michelle192837/test-infra,kubernetes/test-infra,kubernetes/test-infra,fejta/test-infra,pwittrock/test-infra,monopole/test-infra,cjwagner/test-infra,michelle192837/test-infra,michelle192837/test-infra,BenTheElder/test-infra,michelle192837/test-infra,BenTheElder/test-infra,jessfraz/test-infra,jessfraz/test-infra,monopole/test-infra,cblecker/test-infra,jessfraz/test-infra,jessfraz/test-infra,cjwagner/test-infra,cblecker/test-infra,monopole/test-infra,michelle192837/test-infra,fejta/test-infra,pwittrock/test-infra,jessfraz/test-infra,fejta/test-infra,pwittrock/test-infra,kubernetes/test-infra,cjwagner/test-infra,dims/test-infra,michelle192837/test-infra,pwittrock/test-infra,BenTheElder/test-infra,dims/test-infra,monopole/test-infra,dims/test-infra