remove guangzhu from OWNERS

files under this folder are outside of the scope of test harness so there's no need to retain ownership

Change-Id: Ibd2694d33b2fd05202e86f76dcc90c52fb056c45
diff --git a/OWNERS b/OWNERS
index 3a1a038..a53d83e 100644
--- a/OWNERS
+++ b/OWNERS
@@ -9,6 +9,3 @@
 
 # historical/backup
 maco@google.com
-
-# vts tests
-guangzhu@google.com