Add support for enumerating service/endpoint names in container specs

BUG=brillo:959
TEST=run unit tests
TEST=run generate_container_spec on the psyche demo container spec

Change-Id: I2b5388116300817c617227cab45776ce7ef7faf3
Reviewed-on: https://chromium-review.googlesource.com/273350
Reviewed-by: Christopher Wiley <wiley@chromium.org>
Commit-Queue: Chris Masone <cmasone@chromium.org>
Trybot-Ready: Chris Masone <cmasone@chromium.org>
Tested-by: Chris Masone <cmasone@chromium.org>
2 files changed