Automatic update of common submodule

From 3f4aa96 to e8c7a71
diff --git a/common b/common
index 3f4aa96..e8c7a71 160000
--- a/common
+++ b/common
@@ -1 +1 @@
-Subproject commit 3f4aa969cbe39584a649d98d4cf321d78bd73092
+Subproject commit e8c7a71bf3e2ee48f682011bd63d64a8c78ea3b6