Duracloud: Stub out Space

refs #7133

Add empty Space, form, constants etc.
Duracloud: Add fields

refs #7133

Add fields to Duracloud Space. Update places to match: constant, forms,
migration, fixtures, test.
Duracloud: Add session

refs #7133

Add session with auth for use with all the other functions.
Duracloud: Add move from SS

refs #7133