The parser never has supported it, the datastore API did happen to work
but whitespace in key names is a really bad idea and not something I think we
should encourage or support.
Fix test case failures after excplitly ignoring it for variable expansion
purposes.
(Bitbake rev: a2074ddaba6f53962d6caf34dbd27bdbc259935b)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>