tools/functional-tester: update "build" script

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>

tools/functional-tester/build

@@ -5,7 +5,7 @@ if ! [[ "$0" =~ "tools/functional-tester/build" ]]; then
 	exit 255
 fi
 
-CGO_ENABLED=0 go build -a -installsuffix cgo -ldflags "-s" -o bin/etcd-agent ./cmd/tools/functional-tester/etcd-agent
-CGO_ENABLED=0 go build -a -installsuffix cgo -ldflags "-s" -o bin/etcd-tester ./cmd/tools/functional-tester/etcd-tester
-CGO_ENABLED=0 go build -a -installsuffix cgo -ldflags "-s" -o bin/etcd-runner ./cmd/tools/functional-tester/etcd-runner
+CGO_ENABLED=0 go build -a -installsuffix cgo -ldflags "-s" -o bin/etcd-agent ./tools/functional-tester/etcd-agent
+CGO_ENABLED=0 go build -a -installsuffix cgo -ldflags "-s" -o bin/etcd-tester ./tools/functional-tester/etcd-tester
+CGO_ENABLED=0 go build -a -installsuffix cgo -ldflags "-s" -o bin/etcd-runner ./tools/functional-tester/etcd-runner