Issue crc-org#1066 Remove call to logging.Fatal from machine.Start

In case of the daemon, we don't want an error in machine.Start()
to exit the daemon process, logging.Fatal calls os.Exit which
kills the process

pkg/crc/machine/machine.go

@@ -185,8 +185,11 @@ func Start(startConfig StartConfig) (StartResult, error) {
 			return *result, errors.Newf("Error loading bundle metadata: %v", err)
 		}
 		if bundleName != filepath.Base(startConfig.BundlePath) {
-			logging.Fatalf("Bundle '%s' was requested, but the existing VM is using '%s'",
+			logging.Debugf("Bundle '%s' was requested, but the existing VM is using '%s'",
 				filepath.Base(startConfig.BundlePath), bundleName)
+			result.Error = fmt.Sprintf("Bundle '%s' was requested, but the existing VM is using '%s'",
+				filepath.Base(startConfig.BundlePath), bundleName)
+			return *result, errors.Newf("Found a CodeReady Containers VM using bundle %s", filepath.Base(startConfig.BundlePath)
 		}
 		vmState, err := host.Driver.GetState()
 		if err != nil {