test_flows: send dev_set_config to repeaters before tests

https://jira.prplfoundation.org/browse/PPM-143

Send dev_set_config to the repeaters as a preparation to
changing agents logic to wait to dev_set_config or WPS PBC
before going to master discovery in certification mode.

Signed-off-by: Vitalii Komisarenko <[email protected]>

tests/test_flows.py

@@ -1343,5 +1343,11 @@ def test_beacon_report_query(self):
     t.start_test('init')
     env.launch_environment_docker(options.unique_id, options.skip_init, options.tag)
 
+    for agent in env.agents:
+        debug("sending dev_set_config to an agent")
+        agent.cmd_reply("dev_set_config,program,map,backhaul,eth")
+
+    time.sleep(7)
+
     if t.run_tests(options.tests):
         sys.exit(1)