Convert any relative paths of block devices into absolute paths
Convert any relative paths of block devices into absolute paths

This does not verify that the paths exist. What it does is synthesize
the properly formatted absolute path based on the current working directory
and the rules of the platform.

Signed-off-by: mulhern <7b51bcf507bcd7afb72bf8663752c0ddbeb517f6@redhat.com>

stratis-storage/stratis-cli,stratis-storage/stratis-cli