Extend docker-inspect to export image/container metadata
    
    - NVR: docker-1.7.0-7.git6d76e4c
    - built docker @rhatdan/fedora-1.7 commit#6d76e4c
    - built docker-selinux master commit#e86b2bc
    - do not install .../archive/tar in -devel, no longer provided
    
    Signed-off-by: Lokesh Mandvekar <lsm5@fedoraproject.org>