Treated "keywords" branch as master

(The benchmark right now uses master to do things the old way, which
keywords also needs).

Author: jagerman

tools/bench/bench-common.sh

@@ -53,7 +53,7 @@ time_command() {
 
 
 master=
-if [ "$branch" = "upstream" ] || [ "$branch" = "master" ]; then master=1; fi
+if [ "$branch" = "upstream" ] || [ "$branch" = "master" ] || [ "$branch" = "keywords" ] ; then master=1; fi
 
 pad() {
     printf "%${1}s" "$2"