fix(logger): kill temporary build container in "make build"

For some reason the two-stage Dockerfile build process we use elsewhere leaves a container running when logger is built. This changes the Makefile to explicitly catch and kill the logger-build Docker container.

My guess is we aren't complying with some `ONBUILD` hook in `golang:1.3`, but I poked around and couldn't tell why. I don't see where we are explicitly killing any of these -build containers in our two-step process, but *so far* this is the only one that has been misbehaving.

Closes #2137.