use lsblk to figure out if a device is partition or not
use lsblk to figure out if a device is partition or not

Right now we have very crude logic to figure out if a device is partition
or not. It fails on some devices whose names end with a number. Use lsblk
instead to figure out if a device is partition or not.

Signed-off-by: Vivek Goyal <61d11262d0d9873ddb5a887f48fcb04e8c5973d0@redhat.com>

thescriptbender/container-storage-setup,shishir-a412ed/docker-storage-setup