It's possible that it's easier for a nodepool user to just specify a
name or id of a flavor in their config instead of the combo of min-ram
and name-filter.
In order to not have two name related items, and also to not have the
pure flavor-name case use a term called "name-filter" - change
name-filter to flavor-name, and introduce the semantics that if
flavor-name is given by itself, it will look for an exact match on
flavor name or id, and if it's given with min-ram it will behave as
name-filter did already.
Change-Id: I8b98314958d03818ceca5abf4e3b537c8998f248
642f14c076