keep variant setting removed by previous commit
to avoid error like:
===
$~/createhdds/createhdds.py support
...
Traceback (most recent call last):
File "/root/createhdds/createhdds.py", line 821, in <module>
main()
File "/root/createhdds/createhdds.py", line 811, in main
args.func(args, hdds)
File "/root/createhdds/createhdds.py", line 701, in cli_image
img.create(args.textinst)
File "/root/createhdds/createhdds.py", line 291, in create
loctmp.format(fedoradir, str(self.release), variant, arch), "--name", "createhdds",
NameError: name 'variant' is not defined
===
Signed-off-by: Michel Normand <normand@linux.vnet.ibm.com>