Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Zach Robinson:
     move diego classes into Diego namespace ( Travis started: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/26966447 )
     update desire app message for diego ( Travis Unknown )
  Derek Richard:
     Fix Service Plan Visibilities API spec ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/26959028 )
     Fix api docs title for Service Bindings ( Travis Unknown )
  Abhijit Hiremagalur:
     Combine shared controller querying and reading specs to reduce the number of specs run ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/26903468 )
     Combine shared controller enumeration specs to reduce the number of specs run ( Travis Unknown )
     Combine shared controller deletion specs to reduce the number of specs run ( Travis Unknown )
     Combine shared controller collection specs to reduce the number of specs run ( Travis Unknown )

Signed-off-by: Ted Young <tyoung@pivotallabs.com>