Module untangling work

Here is a bit of module untangling work done using structure 101. In a few places we depend on modules but are not making use of the dependency. In other places we depended on a module just because we had one references only, one we could undo.

After this little exercise, we have nicer layering and stuff like hbase-protocol and hbase-protocol-shaded no longer depend on other hbase components. Not everything depends on annotations anymore.

There is way more work to do here but this will do for now.