Update authority proto (#1156)

diff --git a/pkg/authority/v1alpha1/authority.go b/pkg/authority/v1alpha1/authority.go
index e36e29e..579ff4d 100644
--- a/pkg/authority/v1alpha1/authority.go
+++ b/pkg/authority/v1alpha1/authority.go
@@ -100,6 +100,7 @@
 		TrustCerts:             trustedCerts,
 		Token:                  token,
 		TrustedTokenPublicKeys: trustedTokenPublicKeys,
-		ExpireTime:             time.Now().UnixMilli() + (s.Options.CertValidity / 2),
+		RefreshTime:            time.Now().UnixMilli() + (s.Options.CertValidity / 2),
+		ExpireTime:             time.Now().UnixMilli() + s.Options.CertValidity,
 	}, nil
 }
diff --git a/pkg/authority/v1alpha1/ca.pb.go b/pkg/authority/v1alpha1/ca.pb.go
index 5baaf14..d74df2c 100644
--- a/pkg/authority/v1alpha1/ca.pb.go
+++ b/pkg/authority/v1alpha1/ca.pb.go
@@ -110,8 +110,9 @@
 	TrustCerts             []string `protobuf:"bytes,3,rep,name=trust_certs,json=trustCerts,proto3" json:"trust_certs,omitempty"`
 	Token                  string   `protobuf:"bytes,4,opt,name=token,proto3" json:"token,omitempty"`
 	TrustedTokenPublicKeys []string `protobuf:"bytes,5,rep,name=trusted_token_public_keys,json=trustedTokenPublicKeys,proto3" json:"trusted_token_public_keys,omitempty"`
-	ExpireTime             int64    `protobuf:"varint,6,opt,name=expire_time,json=expireTime,proto3" json:"expire_time,omitempty"`
-	Message                string   `protobuf:"bytes,7,opt,name=message,proto3" json:"message,omitempty"`
+	RefreshTime            int64    `protobuf:"varint,6,opt,name=refresh_time,json=refreshTime,proto3" json:"refresh_time,omitempty"`
+	ExpireTime             int64    `protobuf:"varint,7,opt,name=expire_time,json=expireTime,proto3" json:"expire_time,omitempty"`
+	Message                string   `protobuf:"bytes,8,opt,name=message,proto3" json:"message,omitempty"`
 }
 
 func (x *IdentityResponse) Reset() {
@@ -181,6 +182,13 @@
 	return nil
 }
 
+func (x *IdentityResponse) GetRefreshTime() int64 {
+	if x != nil {
+		return x.RefreshTime
+	}
+	return 0
+}
+
 func (x *IdentityResponse) GetExpireTime() int64 {
 	if x != nil {
 		return x.ExpireTime
@@ -336,7 +344,7 @@
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@@ -347,42 +355,44 @@
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 }
 
 var (
diff --git a/pkg/authority/v1alpha1/ca.proto b/pkg/authority/v1alpha1/ca.proto
index f3fbfe8..8cff4b4 100644
--- a/pkg/authority/v1alpha1/ca.proto
+++ b/pkg/authority/v1alpha1/ca.proto
@@ -38,8 +38,9 @@
   repeated string trust_certs = 3;
   string token = 4;
   repeated string trusted_token_public_keys = 5;
-  int64 expire_time = 6;
-  string message = 7;
+  int64 refresh_time = 6;
+  int64 expire_time = 7;
+  string message = 8;
 }
 
 service AuthorityService {