Wrappers and fixes and tweaks

Change-Id: If8a5fd392bf14bae748c5edfe59ac0a4035f7352
Embed thermos-runner in thermos-executor (wtf?)

I guess pants doesn't provide a good way of using a python_binary
artifact as a source file for another target?

Change-Id: I667894f8c25777df1c2843fa5e7ba4bab2ca0295