[role:cert-manager] Add self-signed issuer and certificate

For a private PKI, created a custom root certificate using
self-signed clusterIssuer.
To use this for openstack endpoints, need to set variable
`cert_manager_issuer` as following;
cert_manager_issuer:
  ca:
    secretName: root-secret

Sem-Ver: feature

Change-Id: Ie8f46173f7951c141053ad3cf80a5d8926c95724
3 files changed