Using the same monitor conf for different storage server densities on the new image

[brownleej]

We currently customize the monitor conf for the unified image with different flags based on how many storage servers we are running per disk. This adds some complexity, because we have to switch between different entries in the config map when we are changing the storage server density. On the old image, we were specifying multiple command lines when running multiple storage servers, but that's not the case on the new image, so we should be able to move to using the same monitor conf regardless of storage server density.