Installation / Managing Storage

[dustymabe]

https://github.com/projectatomic/atomic-host-docs/blob/f345e46222961eca0d30a63e67ef7b4b097b02e9/outline.txt#L35

Cover storage scenarios like devicemapper and overlayfs

References:
- https://github.com/projectatomic/atomic-site/blob/master/source/blog/2017-05-15-single-overlayfs-volume.html.md (released during f25AH time frame)
- https://github.com/projectatomic/atomic-site/blob/master/source/blog/2017-05-08-migrate-fedora-atomic-host-to-overlay2.md