functional-tester: use different ports in Procfile

tools/functional-tester/Procfile

@@ -1,4 +1,4 @@
-agent-1: mkdir -p agent-1 && cd agent-1 && ../bin/etcd-agent -etcd-path ../bin/etcd -port localhost:9027 -use-root=false
-agent-2: mkdir -p agent-2 && cd agent-2 && ../bin/etcd-agent -etcd-path ../bin/etcd -port localhost:9028 -use-root=false
-agent-3: mkdir -p agent-3 && cd agent-3 && ../bin/etcd-agent -etcd-path ../bin/etcd -port localhost:9029 -use-root=false
-stresser: sleep 1s && bin/etcd-tester -agent-endpoints "localhost:9027,localhost:9028,localhost:9029"  -client-ports 12379,22379,32379 -peer-ports 12380,22380,32380
+agent-1: mkdir -p agent-1 && cd agent-1 && ../bin/etcd-agent -etcd-path ../bin/etcd -port localhost:19027 -use-root=false
+agent-2: mkdir -p agent-2 && cd agent-2 && ../bin/etcd-agent -etcd-path ../bin/etcd -port localhost:29027 -use-root=false
+agent-3: mkdir -p agent-3 && cd agent-3 && ../bin/etcd-agent -etcd-path ../bin/etcd -port localhost:39027 -use-root=false
+stresser: sleep 1s && bin/etcd-tester -agent-endpoints "localhost:19027,localhost:29027,localhost:39027"  -client-ports 12379,22379,32379 -peer-ports 12380,22380,32380