Merge branch 'stable-2.6' into devel-2.6

* stable-2.6:
  Disable E1101 on ganeti/http/server.py:424
  Fix live migration under xl
  Don't check for xend port when using xl

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Bernardo Dal Seno <bdalseno@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>