Changes the kubelet so it bootstraps off the cert/key specified in the
config file and uses those to request new cert/key pairs from the
Certificate Signing Request API, as well as rotating client certificates
when they approach expiration.
Add test coverage to the certificate manager covering the initialization
scenario where it is initialized with no Certificate Request Signing
client, then the client is added later. This matches how it will be used
when the Certificate Request Signing client is also the consumer of the
certificate manager.
Adds support to the certificate manager so it can be initialized with no
certs and only a connection to the certificate request signing API. This
specifically covers the scenario for the kubelet server certificate,
where there is a request signing client but on first boot there is no
bootstrapping or local certs.
Changes the kubelet so it doesn't use the cert/key files directly for
starting the TLS server. Instead the TLS server reads the cert/key from
the new CertificateManager component, which is responsible for
requesting new certificates from the Certificate Signing Request API on
the API Server.
Bowei Du