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: Ie6e6df4932603e84f66023c6843d58a0d9470f68
Partial-Bug: #1559050
(cherry picked from commit ac04cb9c94)

system_test/actions/base.py

@@ -195,7 +195,6 @@ 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])