update SAI header (sonic-net#344)

lguohan · prsunny · commit e402ff6df7be · 2018-09-11T09:45:37.000-07:00
8db1eaf 2018-09-07 | added vxlan tunnel as possible condition for underlay interface attribute (sonic-net#870) (HEAD, origin/v1.3) [YonatanPitz] Signed-off-by: Guohan Lu <gulv@microsoft.com>
diff --git a/SAI b/SAI
@@ -1 +1 @@
-Subproject commit 67d61eb7738e96ecfb532590e678fee544e816a7
+Subproject commit 8db1eaf7ab5d70fdc916b987bb81fbe54571843f
