Making this change for a few reasons:
- The scaling needs of dopplers and log-cache are often different, so
  grouping them together can be problematic. Dopplers are limited to ~40
  instances and some high traffic foundations need larger log-cache
  instance groups.
- Syslog ingress eliminates the load on dopplers and traffic controllers
  to get envelopes to log-cache. This increases the load slightly on
  diego cells, and eliminates significant load on dopplers/tc's.

It's recommended after deploying this change to evaluate the memory
allocated to doppler nodes and switch them to compute heavy instances and
deploy log-cache to high memory instances.

They didn't seem to be used and would need to be updated to work with
the separate log cache instance group.

We had made these ops files no-ops in an earlier commit, here we are
removing them.