有一步是下载依赖，工程里面自带的 2 个 Gopkg.lock 和 Gopkg.toml 在开源里已经自带了，但按步骤执行 dep ensure 一直卡着不动是为什么，请高手赐教。
[[email protected] golang123]$ dep ensure
Warning: the following project(s) have [[constraint]] stanzas in Gopkg.toml:
However, these projects are not direct dependencies of the current project:
they are not imported in any .go files, nor are they in the 'required' list in
Gopkg.toml. Dep only applies [[constraint]] rules to direct dependencies, so
these rules will have no effect.
Either import/require packages from these projects so that they become direct
dependencies, or convert each [[constraint]] to an [[override]] to enforce rules
on these projects, if they happen to be transitive dependencies.