Fix is_suse() check for openSUSE distros

We need to do a substring match on the vendor here. As most releases return
"openSUSE project" for the vendor.

Change-Id: Ia05db8d93b5e3f42cb6a9c8d77616ca9f7c32039
diff --git a/functions-common b/functions-common
index a26cc50..1452e23 100644
--- a/functions-common
+++ b/functions-common
@@ -433,7 +433,7 @@
         GetOSVersion
     fi
 
-    [ "$os_VENDOR" = "openSUSE" ] || [ "$os_VENDOR" = "SUSE LINUX" ]
+    [[ "$os_VENDOR" =~ (openSUSE) || "$os_VENDOR" == "SUSE LINUX" ]]
 }