drop all use of luci-go deps

These forced inclusion of the luci-go repo into the SDK, and that's not
really necessary here. It's also not working for me when I try to emerge
tnull locally, for some localmirror reasons. It'll be simpler to just
sever this dependency.

TEST=local build and run tnull

Change-Id: I2501e261b51048f6f99d9fc47bbc478557cb227c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/tnull/+/2566703
Commit-Queue: Sean Abraham <seanabraham@chromium.org>
Tested-by: Sean Abraham <seanabraham@chromium.org>
Reviewed-by: Prathmesh Prabhu <pprabhu@google.com>
4 files changed