etcd no longer uses rewritten import paths

[peterbourgon]

This means we can drop the wackycontext, wackygrpc, etc. import names. Unfortunately, etcd accomplishes this feat by leveraging the vendor dir, which is viral, i.e. anything that imports coreos/etcd must have its own vendor dir AND must flatten transitive dependencies from dependent packages into that base vendor dir.

See https://groups.google.com/forum/#!topic/golang-nuts/AnMr9NL6dtc

[peterbourgon]

https://github.com/peterbourgon/wtf 😞

[peterbourgon]

Running go build against metcd will not work by default. Ways to make it work:

• Hack it: rm -rf $GOPATH/src/github.com/coreos/etcd/vendor — done in circle.yml for now
• Fix upstream: see coreos/etcd#4913
• Use a tool: e.g. govendor build, or glide
• Flatten: vendor both metcd and etcd in another repo, and flatten all transitive vendored dependencies — doesn't solve anything for this repo, but solves it for downstream users, will try this approach in flux

Other ways to solve this problem in the general case:

• Never expose external types in your API
  • Simply avoid it in the first place
  • Or make a separate copy of the dependency package in your repo
• Leave the computer industry, become a carpenter
• Others possible