[php-horde-horde/f20] (3 commits) ...obsoletes horde only in f21 and epel7

[Remi Collet]

Summary of changes:

  5f467a3... import from review #949038 (*)
  3c48ace... comments from review #949038 - missing dep on php-filter an (*)
  843975e... obsoletes horde only in f21 and epel7 (*)

(*) This commit already existed in another branch; no separate mail sent