Checking cluster status before actions

* add checking if cluster is operational or error state
  when calling an action to run OSTF tests through fuelclient
* add checking of cluster status when running network
  verification in nailgun

Change-Id: I3f40fb0e0b3d589834c242e73e9f8250daf4e05f
Closes-Bug: #1337887
Closes-Bug: #1337884

fuelclient/cli/actions/health.py

@@ -26,6 +26,12 @@ class HealthCheckAction(Action):
     """
     action_name = "health"
 
+    _allowed_statuses = (
+        'error',
+        'operational',
+        'update_error',
+    )
+
     def __init__(self):
         super(HealthCheckAction, self).__init__()
         self.args = (
@@ -45,6 +51,15 @@ class HealthCheckAction(Action):
                 fuel --env 1 health --check smoke,sanity
         """
         env = Environment(params.env)
+
+        if env.status not in self._allowed_statuses and not params.force:
+            exit_with_error(
+                "Environment is not ready to run health check "
+                "because it is in {0} state. "
+                "Health check is likely to fail because of "
+                "this. Use --force flag to proceed anyway.". format(env.status)
+            )
+
         if env.is_customized and not params.force:
             exit_with_error(
                 "Environment deployment facts were updated. "

fuelclient/objects/environment.py

@@ -152,6 +152,10 @@ class Environment(BaseObject):
         return (serializer or self.serializer).read_from_file(
             settings_file_path)
 
+    @property
+    def status(self):
+        return self.get_fresh_data()['status']
+
     @property
     def settings_url(self):
         return "clusters/{0}/attributes".format(self.id)