Description of problem:
Kickstart using LVM partitioning with LUKS does not accept the --grow option

How reproducible:
Always

Steps to Reproduce:
1. Kickstart using LUKS and LVM with a partition using --grow

Actual results:
"Kickstart insufficient" "('device cannot be smaller than 16 MiB', 'luks5'

Expected results:
Partition is created exactly as when not using LUKS

Additional info:
logvol /opt --name=lv_opt --vgname=vg_rocsoft --size=1 --grow --fsoptions="nodev" --encrypted --cipher=aes-cbc-essiv:sha256 --passphrase=xxxxxx