Bump src/cloud_controller_ng: ** Migration **

** Migration note for deploys: Verify that no service_instance names are longer than 50
chars. Otherwise a deploy will fail on this CCDB migration.

Alan Moran and Ryan Tang (1):
      Validate memory value when creating a new app [finishes #49677443]

David Julia and Jesse Zhang (1):
      Expose interface for creating object from model controller

David Julia and Ryan Tang (1):
      Limit service_instance name column to 50 chars [#50667131]

Gregg Van Hove and Maria Shaldibina (2):
      Add parallel_tests to test gem set
      Don't stage if app has 0 instances

Jesse Zhang (3):
      Update README.md
      Update README.md
      Update README.md

Jesse Zhang and Phan Le (3):
      Corrected type of attribute binding_options to Hash
      simplified the STI logic.
      improve integration test

Mark Rushakoff and Sarah Chandler (1):
      Refactor to improve discoverability of DEA NATS messages

Matthew Horan and Phan Le (4):
      Move gateway callbacks from service binding to service instance.
      decouple Sequel validations from DB constraints
      Remove default values in ServiceBinding
      Supports creating service bindings for provided service instances.

Nicholas Kushmerick (1):
      Send binding_options to service gateway

Ryan Tang (1):
      Limit service instance names to 50 characters
Bump src/cloud_controller_ng:

Onsi Fakhouri and Sarah Chandler (1):
      All DEA staging requests are now async so we are dropping support for synchronous staging.

phanle (1):
      Fix a regression when refactoring: sending nil service binding gateway name instead of service_instance name.
Bump src/gorouter/src/github.com/cloudfoundry/go_cfmessagebus:

Alex Suraci (1):
      add logging API

Bump src/gorouter/src/github.com/cloudfoundry/gorouter:

Alex Suraci (2):
      update README for new repo layout
      set up message bus logger

Bump src/gorouter/src/github.com/cloudfoundry/yagnats:

Alex Suraci (6):
      add logging support
      update .travis.yml
      remove relative imports
      travis: don't recursively get/build
      ignore examples when building
      add gocheck to .travis.yml
Bump src/gorouter/src/github.com/cloudfoundry/go_cfmessagebus:

Alex Suraci (1):
      add missing logger.go
Bump src/dea_next:

CC was bumped and now no longer does synchronous staging, so I'm bumping DEA
so they both have async staging as the default.

Mark Rushakoff (1):
      Use a real patch level in .travis.yml

Mark Rushakoff and Sarah Chandler (1):
      dea.discover is no longer used

Onsi Fakhouri and Sarah Chandler (2):
      Integration tests are green again.
      removed deprecated async flags

Onsi Fakhouri, Sarah Chandler and Tim Labeeuw (1):
      staging is now async.  still need to fix failing rails spec.
Bump src/tests:

Alex Suraci (1):
      update!: correctly default :restart to true
Bump src/tests:

Alex Suraci (1):
      explicitly restart app after modifying
Bump src/tests:

Alex Suraci (1):
      fix/clean up lifecycle spec