When cert dir is relative, cert rotation builds incorrect symlinks
When cert dir is relative, cert rotation builds incorrect symlinks

Symlinks relative to a working directory were being constructed to the
wrong location, leading to failure to refresh client certs.

Kubernetes-commit: 3ec453d0d000a9bd3244d9d455f715bfe64d2e6b

kubernetes/client-go,li-ang/client-go