machine: Print log when downloading bundle

Running `crc start` without the expected bundle available shows a
download progress bar without saying first what it's doing:

INFO Checking if crc daemon plist file is present and loaded
1.73 GiB / 3.09 GiB [------------------>___________________]

This commit adds a "Downloading .." line before to inform the user about
this lengthy operation.

Author: cfergeau

pkg/crc/machine/start.go

@@ -49,6 +49,7 @@ func getCrcBundleInfo(preset crcPreset.Preset, bundleName, bundlePath string) (*
 		return bundleInfo, nil
 	}
 	logging.Debugf("Failed to load bundle %s: %v", bundleName, err)
+	logging.Infof("Downloading bundle: %s...", bundleName)
 	bundlePath, err = bundle.Download(preset, bundlePath)
 	if err != nil {
 		return nil, err

pkg/crc/preflight/preflight_checks_common.go

@@ -98,6 +98,7 @@ func fixBundleExtracted(bundlePath string, preset crcpreset.Preset) func() error
 		}
 
 		var err error
+		logging.Infof("Downloading bundle: %s...", bundlePath)
 		if bundlePath, err = bundle.Download(preset, bundlePath); err != nil {
 			return err
 		}