Godeps: Bump go-systemd, add coreos/pkg/dlopen.

vendor/github.com/coreos/pkg/httputil/cookie.go

@@ -0,0 +1,21 @@
+package httputil
+
+import (
+	"net/http"
+	"time"
+)
+
+// DeleteCookies effectively deletes all named cookies
+// by wiping all data and setting to expire immediately.
+func DeleteCookies(w http.ResponseWriter, cookieNames ...string) {
+	for _, n := range cookieNames {
+		c := &http.Cookie{
+			Name:    n,
+			Value:   "",
+			Path:    "/",
+			MaxAge:  -1,
+			Expires: time.Time{},
+		}
+		http.SetCookie(w, c)
+	}
+}