Install composefs with podman/toolbox to workaround #2275820
    
    containers-common seems to have inadvertently introduced a hard
    dependency on composefs, but not expressed it as a package dep.
    While I'm trying to get that fixed, let's ensure the podman and
    toolbox tests don't fail on it.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>