add unspecified options

pkg/proto/aksnodeconfig/v1/bootstrappingconfig.proto

@@ -18,26 +18,30 @@ message BootstrappingConfig {
   optional string custom_aad_client_id = 5;
 
   enum BootstrappingAuthMethod  {
+    BAM_UNSPECIFIED = 0;
+
     // This is the default K8s bootstrap authentication method - a time limited bootstrap token. It's stored as a secret
     // with a particular type in the API server.
     //nolint:gosec // this is a const string to use in switch statements, not hardcoded credentials
-    BOOTSTRAP_TOKEN = 0;
+    BOOTSTRAP_TOKEN = 1;
     // Secure TLS bootstrapping is a process where the node can use signed metadata from the Azure IMDS service to authenticate
     // against the api server
-    SECURE_TLS_BOOTSTRAPPING = 1;
+    SECURE_TLS_BOOTSTRAPPING = 2;
     // Nodes running outside Azure can use the Azure Arc MSI to authenticate to an API server. This only works when the cluster is
     //  using AAD authentication.
-    ARC_MSI = 2;
+    ARC_MSI = 3;
     // Nodes running inside Azure can use the Azure Arc MSI to authenticate to an API server. This only works when the cluster is
     // using AAD authentication.
-    AZURE_MSI = 3;
+    AZURE_MSI = 4;
   }
 
   enum ClusterJoinMethod  {
+    CJM_UNSPECIFIED = 0;
+
     // The default behaviour is for the node to make a certificate signing request (CSR) and then
     // use that CSR for ongoing communication.
-    GENERATE_CSR = 0;
+    GENERATE_CSR = 1;
     // In some cases, the node will use the bootstrapping auth to register itself as a node and for ongoing communications.
-    USE_BOOTSTRAPPING_AUTH = 1;
+    USE_BOOTSTRAPPING_AUTH = 2;
   }
 }