sysroot: Be more conservative with bootlink optimization
sysroot: Be more conservative with bootlink optimization

Trying to implement "rpm-ostree rollback", in the case where we have 2
deployments with the same bootconfig that we're reordering, we need to
write bootconfig, not just swap the bootlinks.

resin-io/ostree,GNOME/ostree,leandrosansilva/ostree,leandrosansilva/ostree,GNOME/ostree,resin-io/ostree,sujitfulse/ostree,GNOME/ostree,gatispaeglis/ostree,resin-io/ostree,gatispaeglis/ostree,gatispaeglis/ostree,sujitfulse/ostree,leandrosansilva/ostree,GNOME/ostree,leandrosansilva/ostree,GNOME/ostree,gatispaeglis/ostree,sujitfulse/ostree,sujitfulse/ostree,resin-io/ostree,gatispaeglis/ostree,gatispaeglis/ostree,resin-io/ostree,sujitfulse/ostree,leandrosansilva/ostree