Bump src/cloud_controller_ng:

Gregg Van Hove, Mark Rushakoff and Sarah Chandler (1):
      update sinatra and remove the application/json content-type restriction for post and put requests [finishes #52252395]

Jesse Zhang (6):
      drop version in Guardfile
      drop internal update_instance end point
      Change patch level for travis to match production
      Move debugger into development
      bundle without development in Travis
      bundle deployment mode in travis

Mark Rushakoff (1):
      Explicitly include rack-test
Add vcap-common submodule
[#52428137]
fix syslog mailer script