Part1 of eliminating the "shared" directory

Full design in place, but merging code 'cause stuff moves fast!

Finished moving:
* `shared/benchmark` to `tests/benchmark`
* `shared/testing/*.py` to `tests/*py`, then importing all via `__init__.py`
* `shared/server` to `utils/server`
* `shared/jobs` to `chronograph/__init__.py`