Dep helper (#2151)

* Add dep task to update go dependencies

* Update go dependencies

vendor/github.com/gregjones/httpcache/diskcache/diskcache_test.go

@@ -1,42 +0,0 @@
-package diskcache
-
-import (
-	"bytes"
-	"io/ioutil"
-	"os"
-	"testing"
-)
-
-func TestDiskCache(t *testing.T) {
-	tempDir, err := ioutil.TempDir("", "httpcache")
-	if err != nil {
-		t.Fatalf("TempDir: %v", err)
-	}
-	defer os.RemoveAll(tempDir)
-
-	cache := New(tempDir)
-
-	key := "testKey"
-	_, ok := cache.Get(key)
-	if ok {
-		t.Fatal("retrieved key before adding it")
-	}
-
-	val := []byte("some bytes")
-	cache.Set(key, val)
-
-	retVal, ok := cache.Get(key)
-	if !ok {
-		t.Fatal("could not retrieve an element we just added")
-	}
-	if !bytes.Equal(retVal, val) {
-		t.Fatal("retrieved a different value than what we put in")
-	}
-
-	cache.Delete(key)
-
-	_, ok = cache.Get(key)
-	if ok {
-		t.Fatal("deleted key still present")
-	}
-}