zdisks: Put autogenerated images in "images/auto"
zdisks: Put autogenerated images in "images/auto"

We'll then use say releases/ for official releases, so people aren't
blinded by checksums.

giuseppe/rpm-ostree,sujitfulse/rpm-ostree-toolbox,cgwalters/rpm-ostree-cgwalters,projectatomic/rpm-ostree-toolbox,markllama/rpm-ostree-toolbox,tmp-user/rpm-ostree,sujitfulse/rpm-ostree-toolbox,tlitovsk/rpm-ostree-toolbox,tlitovsk/rpm-ostree-toolbox,maxamillion/rpm-ostree-toolbox,mdshuai/rpm-ostree,giuseppe/rpm-ostree,giuseppe/rpm-ostree,mdshuai/rpm-ostree,projectatomic/rpm-ostree-toolbox,maxamillion/rpm-ostree-toolbox,tmp-user/rpm-ostree,maxamillion/rpm-ostree-toolbox,tlitovsk/rpm-ostree-toolbox,sujitfulse/rpm-ostree-toolbox,mdshuai/rpm-ostree,projectatomic/rpm-ostree-toolbox,giuseppe/rpm-ostree-toolbox,tmp-user/rpm-ostree,maxamillion/rpm-ostree-toolbox,markllama/rpm-ostree-toolbox,maxamillion/rpm-ostree-toolbox,markllama/rpm-ostree-toolbox,markllama/rpm-ostree-toolbox,sujitfulse/rpm-ostree-toolbox,cgwalters/rpm-ostree-cgwalters,sujitfulse/rpm-ostree-toolbox,mdshuai/rpm-ostree,markllama/rpm-ostree-toolbox,projectatomic/rpm-ostree-toolbox,giuseppe/rpm-ostree-toolbox,giuseppe/rpm-ostree-toolbox,tlitovsk/rpm-ostree-toolbox,cgwalters/rpm-ostree-cgwalters,giuseppe/rpm-ostree-toolbox,giuseppe/rpm-ostree-toolbox,projectatomic/rpm-ostree-toolbox,tlitovsk/rpm-ostree-toolbox,maxamillion/rpm-ostree-toolbox,giuseppe/rpm-ostree-toolbox,giuseppe/rpm-ostree,sujitfulse/rpm-ostree-toolbox,tlitovsk/rpm-ostree-toolbox,tmp-user/rpm-ostree,markllama/rpm-ostree-toolbox