OSMENG-992 - Implement create model activity

in NS Workflow.

An exception is raised if model already exists

Change-Id: I84dd89850b28287dfefb1abc0d158cc72cd4eb34
Signed-off-by: Patricia Reinoso <patricia.reinoso@canonical.com>
Signed-off-by: Mark Beierl <mark.beierl@canonical.com>
diff --git a/osm_lcm/nglcm.py b/osm_lcm/nglcm.py
index 4c21d6e..6627bc8 100644
--- a/osm_lcm/nglcm.py
+++ b/osm_lcm/nglcm.py
@@ -152,13 +152,14 @@
             VnfInstantiateWorkflow,
         ]
         activities = [
+            ns_data_activity_instance.get_model_info,
             ns_data_activity_instance.prepare_vnf_records,
             ns_data_activity_instance.update_ns_state,
             ns_operation_instance.check_ns_instantiate_finished,
             ns_operation_instance.deploy_ns,
             nslcm_activity_instance.update_ns_lcm_operation_state,
             nslcm_activity_instance.no_op,
-            paas_connector_instance.create_model_if_doesnt_exist,
+            paas_connector_instance.create_model,
             paas_connector_instance.deploy_charm,
             paas_connector_instance.check_charm_status,
             paas_connector_instance.test_vim_connectivity,