Fix Azure interactive authentication

Builder looks up tenant ID before asking for token. Client config did
not allow that. Also found that token provider was not properly
initialized.

Fixes 7267

builder/azure/arm/authenticate_devicewflow.go

@@ -10,7 +10,11 @@ import (
 )
 
 func NewDeviceFlowOAuthTokenProvider(env azure.Environment, say func(string), tenantID string) oAuthTokenProvider {
-	return &deviceflowOauthTokenProvider{}
+	return &deviceflowOauthTokenProvider{
+		env:      env,
+		say:      say,
+		tenantID: tenantID,
+	}
 }
 
 type deviceflowOauthTokenProvider struct {

builder/azure/arm/clientconfig.go

@@ -155,8 +155,7 @@ func (c ClientConfig) useDeviceLogin() bool {
 		c.ClientID == "" &&
 		c.ClientSecret == "" &&
 		c.ClientJWT == "" &&
-		c.ClientCertPath == "" &&
-		c.TenantID == ""
+		c.ClientCertPath == ""
 }
 
 func (c ClientConfig) useMSI() bool {

builder/azure/arm/clientconfig_test.go

@@ -268,11 +268,18 @@ func getCloud() *azure.Environment {
 // tests for assertRequiredParametersSet
 
 func Test_ClientConfig_CanUseDeviceCode(t *testing.T) {
-	cfg := emptyClientConfig()
-	cfg.SubscriptionID = "12345"
-	// TenantID is optional
-
-	assertValid(t, cfg)
+	// TenantID is optional, but Builder will look up tenant ID before requesting
+	t.Run("without TenantID", func(t *testing.T) {
+		cfg := emptyClientConfig()
+		cfg.SubscriptionID = "12345"
+		assertValid(t, cfg)
+	})
+	t.Run("with TenantID", func(t *testing.T) {
+		cfg := emptyClientConfig()
+		cfg.SubscriptionID = "12345"
+		cfg.TenantID = "12345"
+		assertValid(t, cfg)
+	})
 }
 
 func assertValid(t *testing.T, cfg ClientConfig) {