... so that users can customize that option using the native interface.
In TripleO we append additional arguments(to load glance-cache.conf)
and we need to set the option explicitly to ensure the correct file
path is used.
Also, the pipeline parameter is confusing because of its naming
different from the actual parameter in Glance, so this change renames
the parameter as well.
Change-Id: I3d6ce07f44ae526207a30d4b57c2fec7cd6fa3ca
fa5fcb4ab5