Add a test for StrictController.

Bug: 21725996
Bug: 25691379
Change-Id: I24b838161eaf98dede2ae897157ba42414fc926f
diff --git a/server/StrictController.cpp b/server/StrictController.cpp
index a04124d..5aa679f 100644
--- a/server/StrictController.cpp
+++ b/server/StrictController.cpp
@@ -28,6 +28,8 @@
 #include "NetdConstants.h"
 #include "StrictController.h"
 
+auto StrictController::execIptables = ::execIptables;
+
 const char* StrictController::LOCAL_OUTPUT = "st_OUTPUT";
 const char* StrictController::LOCAL_CLEAR_DETECT = "st_clear_detect";
 const char* StrictController::LOCAL_CLEAR_CAUGHT = "st_clear_caught";