Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  James Myers and Sujoy Basu:
     Use CURRENT_TIMESTAMP as the default value for created_at ( Travis created: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/44889124 )
Bump src/acceptance-tests

Bump :
  Joseph Palermo and Serguei Filimonov:
     Add buildpack spec for testing node app with websocket
Revert "Revert "Update manifest fixtures""

This reverts commit 51da30429f664b1423bf402181da1d0d747ce890.
Revert "Revert "Deploy syslog_drain_binder with doppler on loggregator VMs""

This reverts commit 8b42f7259b1e51f08593087daf5f07a24d9bf056.