MDEV-13569: wsrep_info.plugin failed in buildbot with "no nodes coming from prim view

Modify configuration so that all nodes are part of galera cluster
i.e. wsrep_on=ON.

plugin/wsrep_info/mysql-test/wsrep_info/my.cnf

@@ -11,6 +11,7 @@ wsrep_provider=@ENV.WSREP_PROVIDER
 [mysqld.1]
 #galera_port=@OPT.port
 #sst_port=@OPT.port
+wsrep-on=1
 wsrep_provider_options='base_port=@mysqld.1.#galera_port'
 wsrep_sst_receive_address='127.0.0.1:@mysqld.1.#sst_port'
 wsrep_node_name=test-node-1
@@ -18,6 +19,7 @@ wsrep_node_name=test-node-1
 [mysqld.2]
 #galera_port=@OPT.port
 #sst_port=@OPT.port
+wsrep-on=1
 wsrep_cluster_address='gcomm://127.0.0.1:@mysqld.1.#galera_port'
 wsrep_provider_options='base_port=@mysqld.2.#galera_port'
 wsrep_sst_receive_address='127.0.0.1:@mysqld.2.#sst_port'