functional-tester/tester: fix YAML field name

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

tools/functional-tester/tester/local-test.yaml

@@ -8,7 +8,7 @@ agent-configs:
   etcd-client-proxy: false
   etcd-peer-proxy: true
   etcd-client-endpoint: 127.0.0.1:1379
-  etcd-config:
+  etcd:
     name: s1
     data-dir: /tmp/etcd-agent-data-1/etcd.data
     wal-dir: /tmp/etcd-agent-data-1/etcd.data/member/wal
@@ -32,7 +32,7 @@ agent-configs:
   etcd-client-proxy: false
   etcd-peer-proxy: true
   etcd-client-endpoint: 127.0.0.1:2379
-  etcd-config:
+  etcd:
     name: s2
     data-dir: /tmp/etcd-agent-data-2/etcd.data
     wal-dir: /tmp/etcd-agent-data-2/etcd.data/member/wal
@@ -56,7 +56,7 @@ agent-configs:
   etcd-client-proxy: false
   etcd-peer-proxy: true
   etcd-client-endpoint: 127.0.0.1:3379
-  etcd-config:
+  etcd:
     name: s3
     data-dir: /tmp/etcd-agent-data-3/etcd.data
     wal-dir: /tmp/etcd-agent-data-3/etcd.data/member/wal