Fix fuel master node migration test

- Move assigned_slaves attribute from class scope of BaseActions
class to instance scope of ActionTest class. This is to have this
attribute reset before each template based test of the same run
(otherwise it brings slave info from the 1st test to 2nd and so on).
- Add waiting for cluster nodes to be online after migration.

Change-Id: Iafa38f0f3cfdaa04551ffbcdf6bdfacbdd0abedb
Partial-Bug: #1559050

system_test/actions/base.py

@@ -194,7 +194,6 @@ class BaseActions(PrepareActions, HealthCheckActions, PluginsActions):
     base_group = None
     actions_order = None
     cluster_id = None
-    assigned_slaves = set()
     scale_step = 0
 
     def _add_node(self, nodes_list):

system_test/tests/base.py

@@ -22,3 +22,4 @@ class ActionTest(base_test_case.TestBasic, ActionsFactory):
     def __init__(self, config_file=None):
         super(ActionTest, self).__init__()
         self.config_file = config_file
+        self.assigned_slaves = set()

system_test/tests/test_fuel_migration.py

@@ -40,9 +40,8 @@ class FuelMasterMigrate(ActionTest, BaseActions, FuelMasterActions):
         3. Deploy environment
         4. Run network checker
         5. Migrate Fuel Master to the compute node
-        6. Check that containers are up and running on the Fuel Master
-        7. Run network checker
-        8. Run OSTF
+        6. Run network checker
+        7. Run OSTF
     """
 
     actions_order = [
@@ -57,7 +56,6 @@ class FuelMasterMigrate(ActionTest, BaseActions, FuelMasterActions):
         'network_check',
         'start_fuel_migration',
         'check_migration_status',
-        'check_containers',
         'network_check',
         'health_check'
     ]
@@ -129,3 +127,6 @@ class FuelMasterMigrate(ActionTest, BaseActions, FuelMasterActions):
             wait(lambda: not remote.exists("/notready"),
                  timeout=900,
                  timeout_msg="File wasn't removed in 900 sec")
+
+        self.fuel_web.wait_nodes_get_online_state(
+            self.env.d_env.nodes().slaves[:2])