Merge branch 'stable-2.6' into devel-2.6

* stable-2.6:
  Improve error message when migration status fail
  Fix type error in kvm/GetMigrationStatus
  Fix PID file writing in Haskell daemons

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