postprocess: Synthesize tmpfiles.d from /var RPM content
postprocess: Synthesize tmpfiles.d from /var RPM content

OSTree really wants /var to come empty; it's not going to be practical
to change every RPM right now though.  So, let's dynamically turn the
content from /var into systemd-tmpfiles.d snippets.

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