Bump cloud_controller_ng

git shortlog db17a45..873112a
Alex Suraci and Dmitriy Kalinin (1):
  bump default app disk_quota to 1G

Bleicke and Jennifer Hickey (2):
  Update TODO in comments and rebase master
  Merge branch 'optional-framework-runtime' of
  github.com:cloudfoundry/cloud_controller_ng into
  optional-fram

Dmitriy Kalinin and Jesse Zhang (3):
  explicitly require mock_class
  make sure that falsy values for
  stage_async flag are considered falsy
  ignore failure to delete spec log
  when running specs (happens in
  parallel mode)

Dmitriy Kalinin and Kowshik Prakasam
(1):
  include additional staging
  error output

Maria Shaldibina (2):
  Make frameworks and
  runtimes optional
  Make frameworks
  and runtimes
  optional

cf-frameworks (1):
  Merge pull
  request #16
  from
  cloudfoundry/optional-framework-runtime

Change-Id: Ib1c7a4d72ded27cc0fa0bd2fc80d678eef154226