Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  James Myers:
     Reset app_bits_upload_grace_period_in_seconds to 0 when it's negative ( Travis started: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/23053090 )
     Remove mock of uaa_token_coder from symmetric_key spec ( Travis Unknown )
     Split uaa_util.rb and specs into separate files ( Travis Unknown )
     Allow app_bits_upload_grace_period_in_seconds to be configurable ( Travis Unknown )
     Remove unused CF::UAA stub from spec_helper ( Travis Unknown )
  Kai Zhang:
     Change app bits upload controller to reauthorize with grace period ( Travis Unknown )
  Eric Malm:
     Remove deprecated bootstrap_admin_email property from config and templates ( Travis Unknown )
     Extract SecurityContext setup from CC::Controller into separate class ( Travis Unknown )
     Update cf-uaa-lib gem to 2.0.1 ( Travis Unknown )
     Split AppBitsController into separate upload and download controllers ( Travis Unknown )
  David Sabeti and Zach Robinson:
     Refactor sso objects ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/22996594 )
     Handle clients being claimed locally, but not existing in uaa. ( Travis Unknown )

[#68014448]

Signed-off-by: Chris Adams <cadams@pivotallabs.com>
Increase client_max_body_size to 1.5G

* Droplets size are usually 4/3 the size of the app bits, this change allows
  for a little more flexibility.

[#68014448]

Signed-off-by: Chris Adams <cadams@pivotallabs.com>