[ostree] Put variant name in ostree log dir (lsedlar)
    
    - Merge #294 `[ostree] Initialize empty repo` (dennis)
    - [util] Resolve git+https URLs (lsedlar)
    - [ostree] Initialize empty repo (lsedlar)
    - [test] Add checks for created images (lsedlar)
    - Fix caching global ksurl (lsedlar)
    - include tests/fixtures in manifest (dennis)
    
    Signed-off-by: Dennis Gilmore <dennis@ausil.us>