Add Breaks: ssssd<<2.6.3-3 for libldb2 since we moved ldb modules
when started building ldb from samba sources, and up until 2.6.3-3,
sssd had hardcoded --with-ldb-lib-dir instead of using our pkgconfig-
provided value.  Ditto for samba-dsdb-modules.

We can't move ldb modules freely because of this usage in other programs.

While at it, remove all existed Breaks/Replaces from there for packages
which are not relevant anymore (like libldb0).