docker-storage-setup: Use --storage-driver instead of -s
docker-storage-setup: Use --storage-driver instead of -s

Use --storage-driver instead of -s. It might help with pattern searching
little bit down the line.

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

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