Fix missing timeout

Change-Id: Ib42bdf54e683f535205e1e4bb7edbeb49fea6e19

stacklight_tests/zabbix/test_system.py

@@ -16,7 +16,6 @@
 from fuelweb_test.helpers.decorators import log_snapshot_after_test
 from netaddr import IPNetwork
 from proboscis import test
-
 from stacklight_tests.zabbix import api
 
 
@@ -59,7 +58,7 @@ class TestZabbixPluginSystem(api.ZabbixApi):
                 'slave-03': ['controller'],
                 'slave-04': ['compute'],
                 'slave-05': ['cinder']
-            }
+            }, timeout=10800
         )
 
         self.check_plugin_online()