Figure out Sub Command pattern between zk, snapshots, package, and auth

We have a number of ways of grouping sub commands together.  Here is how zk works:

bin/solr zk cp

bin/solr zk ls

bin/solr zk upconfig

We have for snapshots:

bin/solr snapshot-create

bin/solr snapshot-delete

And then for collections we have a bare:

bin/solr create

bin/solr delete

Plus, for packages we have

bin/solr package list-installed

bin/solr package install

What do we like?   in the above list, they all have a seperate SomethingTool.java pattern, except for Package which has all the commands folded into one giant PackageTool.java file.