fixed the unneeded tenant id validation in azurecli login (#637)

Author: weinong

pkg/internal/token/azureclicredential.go

@@ -16,9 +16,6 @@ type AzureCLICredential struct {
 var _ CredentialProvider = (*AzureCLICredential)(nil)
 
 func newAzureCLICredential(opts *Options) (CredentialProvider, error) {
-	if opts.TenantID == "" {
-		return nil, fmt.Errorf("tenant ID cannot be empty")
-	}
 	cred, err := azidentity.NewAzureCLICredential(&azidentity.AzureCLICredentialOptions{
 		TenantID: opts.TenantID,
 	})

pkg/internal/token/azureclicredential_test.go

@@ -20,11 +20,6 @@ func TestNewAzureCLICredential(t *testing.T) {
 			},
 			expectName: "AzureCLICredential",
 		},
-		{
-			name:           "missing tenant ID",
-			opts:           &Options{},
-			expectErrorMsg: "tenant ID cannot be empty",
-		},
 	}
 
 	for _, tc := range testCases {