```
$ gvt delete golang.org/x/net/context
$ gvt fetch golang.org/x/net/context
2018/07/23 18:03:49 Fetching: golang.org/x/net/context
$ git grep -l "golang.org/x/net/context" | grep -v vendor | xargs sed -i '' 's:golang.org/x/net/context:context:g'
$ git grep -l "context/ctxhttp" | grep -v vendor | xargs sed -i '' 's:context/ctxhttp:golang.org/x/net/context/ctxhttp:g'
$ gofmt -s -w app
$ gofmt -s -w common
$ gofmt -s -w probe
$ gofmt -s -w prog
$ gofmt -s -w tools
```
fixed a bunch of:
```
cannot use func literal (type func("github.com/weaveworks/scope/vendor/golang.org/x/net/context".Context) error) as type func("context".Context) error
```