abstractions/samba: allow ldb2 paths
libldb packaging in openSUSE changes to use "ldb2" in the path, adjust the abstraction accordingly.
Patch by Samuel Cabrero scabrero@suse.de via https://build.opensuse.org/request/show/947009
References:
- https://bugzilla.opensuse.org/show_bug.cgi?id=1192684 (non-public)
- https://build.opensuse.org/request/show/946250 (ldb packaging change)
- https://build.opensuse.org/request/show/946251 (samba packaging change)
I propose this patch for 3.0 and master. (Backporting to older branches can't hurt, but systems using 2.13.x or older probably won't see the ldb2 path.)