kola/tests: use H.Tempfile() to access logs in coreos.unique.boot.fai…

…lure

See: #3670
Reference: #3670 (comment)

mantle/kola/tests/ignition/qemufailure.go

@@ -154,10 +154,7 @@ func ignitionFailure(c cluster.TestCluster) error {
 	builder := platform.NewQemuBuilder()
 	defer builder.Close()
 	// Create a temporary log file
-	consoleFile, err := builder.TempFile("console.log")
-	if err != nil {
-		return err
-	}
+	consoleFile := c.H.TempFile("console-")
 	// Instruct builder to use it
 	builder.ConsoleFile = consoleFile.Name()
 	builder.SetConfig(failConfig)
@@ -182,11 +179,8 @@ func ignitionFailure(c cluster.TestCluster) error {
 func dualBootfsFailure(c cluster.TestCluster) error {
 	builder := platform.NewQemuBuilder()
 	defer builder.Close()
-	// Create a temporary log file
-	consoleFile, err := builder.TempFile("console.log")
-	if err != nil {
-		return err
-	}
+	// Create a temporary log file allocated in the output dir of the test
+	consoleFile := c.H.TempFile("console-")
 	// Instruct builder to use it
 	builder.ConsoleFile = consoleFile.Name()
 	// get current path and create tmp dir
@@ -239,10 +233,7 @@ func dualBootfsIgnitionFailure(c cluster.TestCluster) error {
 	builder := platform.NewQemuBuilder()
 	defer builder.Close()
 	// Create a temporary log file
-	consoleFile, err := builder.TempFile("console.log")
-	if err != nil {
-		return err
-	}
+	consoleFile := c.H.TempFile("console-")
 	// Instruct builder to use it
 	builder.ConsoleFile = consoleFile.Name()
 	failConfig, err := conf.EmptyIgnition().Render(conf.FailWarnings)