Fix service_provisioner test
remove redundant background thread for SequelVarz

This creates its own thread that updates
VCAP::Component.varz[:vcap_sequel] every second.

I can find no reference to vcap_sequel in
cloud_controller_ng.

I removed this and all tests pass.
Add custom buildpack controller that takes a tar and adds it to a custom buildpack blobstore
Adjust to new autoload style
Align the controller with the others.
Create the access rules
Allow buildpacks to have a priority
Allow admins to retrieve build pack bits
Remove Model namespace
Refactor routes to simplify buildpack uploads
Expose new buildpack and delete old when updating
Prevent duplicate updates of a buildpack
[#56371214] CC stores syslog_drain_url when returned by brokers during bind
Merge branch 'pr/86'
[#56371214] Pass syslog_drain_url down to DEA during app start
backfilled unit test in service provisioner