NVR: docker-2:1.12.3-21.git47e22f2
    
    - Resolves: #1384205 - include rhel-push-plugin
    - Resolves: #1384202, #1384190 - add Red Hat's container registry
    - built docker @projectatomic/docker-1.12 commit 47e22f2
    - built docker-selinux commit 51001dd
    - built d-s-s commit c9faba1
    - built docker-novolume-plugin commit c521254
    - built docker-runc @projectatomic/runc-1.12 commit aa86071
    - built docker-containerd commit b818e74
    - built docker-v1.10-migrator commit 994c35c
    - built rhel-push-plugin commit eb9e6be
    - built docker-lvm-plugin commit bc03b53
    
    Signed-off-by: Lokesh Mandvekar <lsm5@fedoraproject.org>