[sairedis]: update sairedis submodule (#974)

lguohan · web-flow · commit 0d978b5b21bb · 2017-09-21T12:31:02.000-07:00
diff --git a/src/sonic-sairedis b/src/sonic-sairedis
@@ -1 +1 @@
-Subproject commit 3cbff4026f2bb1afda1c5965db60d30666980675
+Subproject commit 79bd891ca5337222701cd51ee5b266d2e485c492
