prodvider: use SANs in service certificates

This fixes compatibility with prodaccess tools built with Go 1.15, which
introduced 'X.509 CommonName deprecation' [1].

[1] - https://golang.org/doc/go1.15#commonname

Change-Id: I228cde3e5651a3e36f527783f2ccb4a2f6b7a8e3

cluster/kube/lib/prodvider.libsonnet

@@ -9,7 +9,7 @@ local kube = import "../../../kube/kube.libsonnet";
 
         cfg:: {
             namespace: "prodvider",
-            image: "registry.k0.hswaw.net/q3k/prodvider:1596298570-f3312ef77ed0db94e20944efc6395750072f54d5",
+            image: "registry.k0.hswaw.net/q3k/prodvider:1601735780-d6c072a90e70b467a77039daebe602c77b4a84a1",
 
             apiEndpoint: error "API endpoint must be set",
 

cluster/prodvider/certs.go

@@ -57,6 +57,7 @@ func (p *prodvider) makeSelfCSR() ([]byte, []byte, error) {
 				OU: signerCert.Subject.OrganizationalUnit[0],
 			},
 		},
+		Hosts: []string{flagProdviderCN},
 	}
 
 	g := &csr.Generator{
@@ -68,7 +69,7 @@ func (p *prodvider) makeSelfCSR() ([]byte, []byte, error) {
 
 func (p *prodvider) makeSelfCertificate(csr []byte) ([]byte, error) {
 	req := signer.SignRequest{
-		Hosts:   []string{},
+		Hosts:   []string{flagProdviderCN},
 		Request: string(csr),
 		Profile: "server",
 	}