growRootFileSystem: Use '/sysroot' option for xfs_growfs instead disk…

… partition

The root partition for both microshift and openshift bundle is mounted
on `/sysroot` as xfs file system. So we can directly use this partition
to extend the size instead specifically provide the
device mapper path `/dev/rhel/root` (in case of microshift) or
block device partition `/dev/vda[n]` (in case of openshift).

This will help us to simplify same command for both types of bundles.

pkg/crc/machine/start.go

@@ -134,10 +134,11 @@ func growRootFileSystem(sshRunner *crcssh.Runner, preset crcPreset.Preset) error
 	}
 
 	logging.Infof("Resizing %s filesystem", rootPart)
-	if _, _, err := sshRunner.RunPrivileged("Remounting /sysroot read/write", "mount -o remount,rw /sysroot"); err != nil {
+	rootFS := "/sysroot"
+	if _, _, err := sshRunner.RunPrivileged(fmt.Sprintf("Remounting %s read/write", rootFS), "mount -o remount,rw", rootFS); err != nil {
 		return err
 	}
-	if _, _, err = sshRunner.RunPrivileged(fmt.Sprintf("Growing %s filesystem", rootPart), "xfs_growfs", rootPart); err != nil {
+	if _, _, err = sshRunner.RunPrivileged(fmt.Sprintf("Growing %s filesystem", rootFS), "xfs_growfs", rootFS); err != nil {
 		return err
 	}