This package contains public/private key utilities copied directly from
client-go/util/cert. All imports were updated.
Future PRs will actually refactor the libraries.
Updates #71004
This avoids ending in a wrong cluster state by assuming that the
present certificates will work. It is specially important when we
are growing etcd from 1 member to 2, in which case in case of failure
upon joining etcd will be unavailable.
