Cleanup vendor (#5726)

* Cleanup vendor

Gopkg.toml

@@ -1,26 +1,10 @@
-# Gopkg.toml example
-#
-# Refer to https://github.com/golang/dep/blob/master/docs/Gopkg.toml.md
-# for detailed Gopkg.toml documentation.
-#
-# required = ["github.com/user/thing/cmd/thing"]
-# ignored = ["github.com/user/project/pkgX", "bitbucket.org/user/project/pkgA/pkgY"]
-#
-# [[constraint]]
-#   name = "github.com/user/project"
-#   version = "1.0.0"
-#
-# [[constraint]]
-#   name = "github.com/user/project2"
-#   branch = "dev"
-#   source = "github.com/myfork/project2"
-#
-# [[override]]
-#  name = "github.com/x/y"
-#  version = "2.4.0"
-
 ignored = ["github.com/coreos/etcd/etcdserver", "github.com/coreos/etcd/mvcc", "github.com/coreos/etcd/auth"]
 
+[prune]
+  non-go = true
+  go-tests = true
+  unused-packages = true
+
 [[constraint]]
   branch = "master"
   name = "github.com/BurntSushi/toml"

hack/clean_vendor.sh

@@ -2,3 +2,5 @@ find vendor \( -type f -or -type l \)  -not -name "*.go" -not -name "LICENSE" -n
 # delete all test files
 find vendor -type f -name "*_generated.go" | xargs -I {} rm {}
 find vendor -type f -name "*_test.go" | xargs -I {} rm {}
+find vendor -type d -name "_vendor" | xargs -I {} rm -rf {}
+find vendor -type d -empty | xargs -I {} rm -rf {}