This doesn't fix anything broken. But we have config-go which exports
KUBE_REPO_ROOT and KUBE_TARGET. Using those means the test scripts can
be more easily moved around the repo and still work. Especially in
hack/test-integration.sh where we use hack/build-go.sh which is going
to use KUBE_TARGET to place the binary, then we use a different method
to find/execute the binary...
Tested: Passed -version argument to kubelet (and all other binaries):
$ output/go/bin/kubecfg -version
Kubernetes version 0.1, build 6454a541fd56
Signed-off-by: Filipe Brandenburger <filbranden@google.com>
