Merge remote branch 'origin/devel-2.0' into devel-2.1

* origin/devel-2.0:
  Fix two potentially endless loops in http library
  Update NEWS file and bump version to 2.0.6
  ganeti-cleaner: does 'echo 0' instead of 'exit 0'

Conflicts:
	NEWS: Trivial
	configure.ac: Trivial

Reviewed-by: Iustin Pop <iustin@google.com>