Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Abhijit Hiremagalur:
     Extract DesireRequest from Diego::Client ( Travis Unknown )
     Avoid second loop ( Travis Unknown )
     Extract StagingRequest out of Diego::Client ( Travis Unknown )
     Extract Environment out of Diego::Client ( Travis Unknown )
     Make methods private where possible ( Travis Unknown )
     Extract classes into own files ( Travis Unknown )

Signed-off-by: Peter Parente <pparent@us.ibm.com>