Drop /var/home -> /home equivalency rule
    
    This was previously needed because on RPM-OSTree systems, user homes
    were located in `/var/home` while the default home specified in
    `etc/default/useradd` was still `/home`. This meant that `genhomedircon`
    (which parses `/etc/default/useradd` to find the homedir) rendered the
    `HOME_DIR` template rules as `/home` into `file_contexts.homedirs`. So
    then, we needed this equivalency rule so that `/var/home/...` was
    equivalent to the generated `/home/...` rules.
    
    Now however, RPM-OSTree correctly fixes `/etc/default/useradd` to point
    to `/var/home` [1]. This now means that `file_contexts.homedirs` does
    correctly hold `/var/home/...` rules. Thus we no longer need this
    equivalency rule. In fact, it now actively prevents proper labeling of
    the home dirs since `/home/...` is now considered `default_t` [2]. If
    anything, we'd want the *inverse* rule of `/home --> `/var/home`, but
    only on RPM-OSTree systems, which I'm not sure how easy it'd be to do
    here. In practice, since SELinux uses the resolved path before matching
    a rule, all paths under `/home/...` will end up as `/var/home/...`.
    
    IOW, the hack we added to make `/var/home` labeled like `/home` on
    RPM-OSTree systems is no longer needed now that RPM-OSTree correctly
    sets `HOME`, which SELinux picks up on.
    
    As for root's home, it's part of the main context list and isn't
    templated, so it's always `/root`, and so we do still need the
    equivalency rule there.
    
    [1] https://github.com/projectatomic/rpm-ostree/pull/1726
    [2] https://bugzilla.redhat.com/show_bug.cgi?id=1669982