[pytest/f19] (5 commits) ...Use python-sphinx for rhel > 6 (rhbz#973318).

[Thomas Moschny]

Summary of changes:

  6e12e2a... Update to 2.3.5. (*)
  0b8017b... Docutils needed now to build README.html. (*)
  3bf32da... Add some BR optionally used by the testsuite. (*)
  5c13630... Update BR to use python-pexpect instead of pexpect. (*)
  0560a6d... Use python-sphinx for rhel > 6 (rhbz#973318). (*)

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