Description of problem:
We have blindly replace docker with docker-latest in /usr/bin/docker-latest-storage-setup even with bash variables. It looks like "-" is not an acceptable identifier in bash. Hence, we ran into troubles like,

May 02 10:30:09 rhel-k8s-storage-node.os1.phx2.redhat.com docker-latest-storage-setup[7853]: /usr/bin/docker-latest-storage-setup: line 372: local: `docker-latest_devmapper_meta_dir=/var/lib/docker-latest/devicemapper/metadata/': not a valid identifier

We need to audit to make sure "-" does not appear in any bash vars there.

Version-Release number of selected component (if applicable):
# rpm -qa | grep docker
docker-forward-journald-1.9.1-38.el7.x86_64
docker-selinux-1.9.1-38.el7.x86_64
docker-common-1.9.1-38.el7.x86_64
docker-rhel-push-plugin-1.10.3-19.el7.x86_64
docker-latest-1.10.3-19.el7.x86_64
docker-lvm-plugin-1.10.3-19.el7.x86_64
docker-1.9.1-38.el7.x86_64
docker-novolume-plugin-1.10.3-19.el7.x86_64

How reproducible:
always