fix errors in beta, pass config.userAgent for tests

Author: megan07

third_party/terraform/utils/bootstrap_utils_test.go

@@ -238,7 +238,7 @@ func BootstrapSharedTestNetwork(t *testing.T, testId string) string {
 			"autoCreateSubnetworks": false,
 		}
 
-		res, err := sendRequestWithTimeout(config, "POST", project, url, "", netObj, 4*time.Minute)
+		res, err := sendRequestWithTimeout(config, "POST", project, url, config.userAgent, netObj, 4*time.Minute)
 		if err != nil {
 			t.Fatalf("Error bootstrapping shared test network %q: %s", networkName, err)
 		}

third_party/terraform/utils/stateful_mig_polling.go.erb

@@ -16,7 +16,7 @@ func resourceComputePerInstanceConfigPollRead(d *schema.ResourceData, meta inter
 		config := meta.(*Config)
 		userAgent, err := generateUserAgentString(d, config.userAgent)
 		if err != nil {
-			return err
+			return nil, err
 		}
 
 		url, err := replaceVars(d, config, "{{ComputeBasePath}}projects/{{project}}/zones/{{zone}}/instanceGroupManagers/{{instance_group_manager}}/listPerInstanceConfigs")
@@ -48,7 +48,7 @@ func resourceComputeRegionPerInstanceConfigPollRead(d *schema.ResourceData, meta
 		config := meta.(*Config)
 		userAgent, err := generateUserAgentString(d, config.userAgent)
 		if err != nil {
-			return err
+			return nil, err
 		}
 
 		url, err := replaceVars(d, config, "{{ComputeBasePath}}projects/{{project}}/regions/{{region}}/instanceGroupManagers/{{region_instance_group_manager}}/listPerInstanceConfigs")
@@ -84,7 +84,7 @@ func findInstanceName(d *schema.ResourceData, config *Config) (string, error) {
 
 	userAgent, err := generateUserAgentString(d, config.userAgent)
 	if err != nil {
-		return err
+		return "", err
 	}
 
 	project, err := getProject(d, config)