Description of problem:
When running 'docker-latest-storage-setup' on an upgraded RHELAH, the service fails with the error:

/usr/bin/docker-latest-storage-setup: line 372: local: `docker-latest_devmapper_meta_dir=/var/lib/docker-latest/devicemapper/metadata/': not a valid identifier


Version-Release number of selected component (if applicable):
# rpm -q docker-latest
docker-latest-1.10.3-19.el7.x86_64


How reproducible:
Pretty consistently

Steps to Reproduce:
1.  Boot into RHELAH 7.2.3-1
2.  Upgrade to 7.2.4 and reboot
3.  systemctl stop docker
4.  systemctl start docker-latest-storage-setup


Actual results:
Apr 29 19:56:10 rhel-atomic-7.2-test systemd[1]: Starting Docker Storage Setup...
Apr 29 19:56:10 rhel-atomic-7.2-test docker-latest-storage-setup[11457]: /usr/bin/docker-latest-storage-setup: line 372: local: `docker-latest_devmapper_meta_dir=/var/lib/docker-latest/devicemapper/metadata/': not a valid identifier
Apr 29 19:56:10 rhel-atomic-7.2-test systemd[1]: docker-latest-storage-setup.service: main process exited, code=exited, status=1/FAILURE
Apr 29 19:56:10 rhel-atomic-7.2-test systemd[1]: Failed to start Docker Storage Setup.
Apr 29 19:56:10 rhel-atomic-7.2-test systemd[1]: Unit docker-latest-storage-setup.service entered failed state.
Apr 29 19:56:10 rhel-atomic-7.2-test systemd[1]: docker-latest-storage-setup.service failed.



Expected results:
'docker-latest-pool' LV created


Additional info:
I found that if I change the name of the variable 'docker-latest_devmapper_meta_dir' in the script to use all underscores 'docker_latest_devmapper_meta_dir', the script will run sucessfully.


-bash-4.2# cp /usr/bin/docker-latest-storage-setup /var/
-bash-4.2# sed -i 's/docker-latest_devmapper_meta_dir/docker_latest_devmapper_meta_dir/' /var/docker-latest-storage-setup 
-bash-4.2# /var/docker-latest-storage-setup 
  Rounding up size to full physical extent 24.00 MiB
  Logical volume "docker-latest-poolmeta" created.
  Logical volume "docker-latest-pool" created.
  WARNING: Converting logical volume atomicos/docker-latest-pool and atomicos/docker-latest-poolmeta to pool's data and metadata volumes.
  THIS WILL DESTROY CONTENT OF LOGICAL VOLUME (filesystem etc.)
  Converted atomicos/docker-latest-pool to thin pool.
  Logical volume "docker-latest-pool" changed.
-bash-4.2# lvs
  LV                 VG       Attr       LSize Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  docker-latest-pool atomicos twi-a-t--- 4.00g             0.48   0.16                            
  docker-pool        atomicos twi-a-t--- 6.70g             0.87   0.16                            
  root               atomicos -wi-ao---- 2.93g                                                    
-bash-4.2# systemctl start docker-latest
-bash-4.2# docker info
Containers: 0
Images: 0
Server Version: 1.10.3
Storage Driver: devicemapper
 Pool Name: atomicos-docker--latest--pool
 Pool Blocksize: 524.3 kB
 Base Device Size: 10.74 GB
 Backing Filesystem: xfs
 Data file: 
 Metadata file: 
 Data Space Used: 20.45 MB
 Data Space Total: 4.295 GB
 Data Space Available: 4.275 GB
 Metadata Space Used: 40.96 kB
 Metadata Space Total: 25.17 MB
 Metadata Space Available: 25.12 MB
 Udev Sync Supported: true
 Deferred Removal Enabled: true
 Deferred Deletion Enabled: true
 Deferred Deleted Device Count: 0
 Library Version: 1.02.107-RHEL7 (2015-12-01)
Execution Driver: native-0.2
Logging Driver: journald
Kernel Version: 3.10.0-327.18.2.el7.x86_64
Operating System: Red Hat Enterprise Linux Atomic Host 7.2
CPUs: 2
Total Memory: 1.797 GiB
Name: rhel-atomic-7.2-test
ID: 7CGH:IC22:KP25:XCZU:LD6K:56GI:DX26:FFED:XJFO:P4Q5:K3JP:CJ4S