Java Buildpack v2.6

This change updates the Java BUildpack to version 2.6.  Version 2.6
has the following highlights:

* Print OutOfMemory diagnostics to Loggregator (via Troy Astle)
* Support for custom CA certificates when download from a repository
  (via Dave Head-Rapson)
* Tomcat Redis Session Replication support for alternate Redis
  services (via Neil Aitken)
* Improved SSL Diagnostics

Both the online and offline buildpacks are updated as part of this
change.
Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Jeff Hui and Whitney Schaefer:
     Updated API version checksum. ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/42235520 )
     Added api documentation for service broker audit events. ( Travis Failed: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/42232639 )
     Added api documentation for service audit events. ( Travis Failed: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/42231022 )
     Added audit event when deleting a service via catalog sync ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/42226409 )
     Added audit event for updating services via catalog sync. ( Travis Unknown )
  Jeff Hui:
     Create service audit event when creating service when syncing from the catalog. ( Travis Unknown )
Bump src/cloud_controller_ng

Signed-off-by: Ted Young <tyoung@pivotal.io>
Merge remote-tracking branch 'origin/pr/570' into develop
Bump src/cloud_controller_ng

[finishes #81909020]