Resolves: rhbz#1601944 - Samba AD is broken with samba 4.8.3 update (and libldb)
    
    libldb-1.4.0 was not tested with samba-dc-4.8.x.
    This patch use fake downgrade to 1.3.4 which works well with samba-4.8
    
    sh [~/samba]$ git branch -r --contains ldb-1.3.4
      origin/v4-8-stable
      origin/v4-8-test
    sh [~/samba]$ git branch -r --contains ldb-1.4.0
      origin/HEAD -> origin/master
      origin/master
      origin/v4-9-stable
      origin/v4-9-test
    
    It is not ideal solution but we decided to avoid introducing epoch.
    Upgrade patch from f27 is not a problem because libldb >= 1.3.2 works
    well with any version of sssd without rebuilding and samba-dc has strict
    requires on libldb.
    
    There are following auto-generated requires in samba-dc
      Requires: libldb = 1.3.2 in fc27
      Requires: libldb = 1.4.0 in fc28 (libldb-1.4.0-1.fc28.1.3.4.1 would match)
      Requires: libldb = 1.4.1 in fc29