ipsec-tools: revert accidentally increased value for MAXNS.

Change-Id: Ib67e9ed5bcc49712f246829e715afe48e8a87e00
diff --git a/src/racoon/isakmp_cfg.h b/src/racoon/isakmp_cfg.h
index dcffb74..253a17f 100644
--- a/src/racoon/isakmp_cfg.h
+++ b/src/racoon/isakmp_cfg.h
@@ -38,7 +38,7 @@
 #ifdef ANDROID_PATCHED
 #include <arpa/inet.h>
 #ifndef MAXNS
-#define MAXNS 16
+#define MAXNS 2
 #endif
 #endif