Merge branch 'stable-2.2' into devel-2.2

* stable-2.2:
  Fix pylint warning in http/__init__.py
  Allow SSL ciphers to be overridden in HTTP server
  If we had any errors in setup in one of the hosts, exit with non-zero

Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>