[swss]: sonic-swss submodule update (#1847)

pavel-shirshov · lguohan · commit 7c632a903a6e · 2018-07-07T16:58:39.000-07:00
Fixes in bufferorchs ready_lists
diff --git a/src/sonic-swss b/src/sonic-swss
@@ -1 +1 @@
-Subproject commit 19f9108641571ee38903bb4ad9fb6969a7f0437e
+Subproject commit 5d31b2db455763eafce8ac6fac2a137d9e3bd2c4
