Use correct IP for bench_server

roles/bench-server/defaults/main.yml

@@ -3,7 +3,7 @@
 bench_server_packages:
   - ubicast-benchmark
 
-bench_server: 127.0.0.1
+bench_server: "{{ hostvars[groups['bench_server'][0]]['ansible_default_ipv4']['address'] }}"
 bench_time_stat: 15000
 
 bench_host: "{{ envsetup_ms_server_name | d() }}"

roles/bench-worker/defaults/main.yml

@@ -3,7 +3,7 @@
 bench_worker_packages:
   - ubicast-benchmark
 
-bench_server: 127.0.0.1
+bench_server: "{{ hostvars[groups['bench_server'][0]]['ansible_default_ipv4']['address'] }}"
 bench_time_stat: 15000
 
 bench_host: "{{ envsetup_ms_server_name | d() }}"