Remove unused payload column from sub-select that fails in postgres.  Use ...

- Initial targetWorkerCount must be subject to pool size limits
- Use consistent workerSetupData for the entire autoscaling run
- Don't call terminate() when we have nothing to terminate
- Terminate obsolete workers even faster

Autoscaling: Move target count independent of actual count.

- Log and return immediately when workerSetupData is null
- Allow provisioning more nodes while other nodes are still provisioning
- Add tests for bumping up the minimum version

Indexing service bugs

This should let us grow and shrink the worker pool in chunks when necessary
(like when a bunch of them go offline, or when there is a worker version
change).

So prevent them from being created, through checks in AbstractFixedIntervalTask
and TaskLockbox.tryLock.

Each one now one operates on at most a collection of segments that comprise
a single partition. The main purpose of this change is to prevent audit log
payload sizes from getting out of control.

StatusResource

misses testing reloading of modules currently

fix hadoop intake's parser exception catching (was too specific)