Revert "add host unit tests"

The host unit tests CL causes merge conflicts,
as well as semantic conflicts, for some other
code that is higher priority to get into the 
tree.

This reverts commit 847e71bde2da917e035d3ebbf635bdfda7eca578.

Change-Id: I6acc85ef7f5a68fa9f72852189ad9cfa892cbc1f
2 files changed