FS-7019 swap debian/ubuntu autodetection order

debian/util.sh

@@ -387,12 +387,12 @@ build_all () {
   [ -n "$archs" ] || archs="amd64 i386"
   if [ -z "$distros" ]; then
     case "$(lsb_release -is)" in
-      Ubuntu)
-        distros="utopic trusty"
-        ;;
       Debian)
         distros="sid jessie wheezy"
         ;;
+      Ubuntu)
+        distros="utopic trusty"
+        ;;
       *)
         echo "Unknown distribution"
         exit -1