This commit reimplements hack/e2e-suite/liveness.sh in Go as part of cmd/e2e.
Tested by running it on a live cluster:
$ cmd/e2e --host=https://w.x.y.z --provider=gce -t TestLivenessHttp -t TestLivenessExec
I0122 08:12:53.183298 6502 liveness.go:72] Restart count of pod liveness-exec-6f917474-a251-11e4-8cc2-d4ae52bb3eea increased from 0 to 1 during the test
I0122 08:13:23.605471 6502 liveness.go:72] Restart count of pod liveness-http-84d28569-a251-11e4-8cc2-d4ae52bb3eea increased from 0 to 1 during the test
Also ran the full e2e suite including kube-up/kube-down to confirm it works.