Remove x-kubernetes-preserve-unknown-fields from Issuer and ClusterIssuer CRDs
Remove x-kubernetes-preserve-unknown-fields from Issuer and ClusterIssuer CRDs

Signed-off-by: Yann Soubeyrand <1cea24d823f6bb205556db9c0e7ad539a8da6c63@camptocamp.com>

jetstack/cert-manager,cert-manager/cert-manager,cert-manager/cert-manager,jetstack-experimental/cert-manager,jetstack-experimental/cert-manager,jetstack-experimental/cert-manager,cert-manager/cert-manager,jetstack/cert-manager,jetstack/cert-manager