fix deploy nova failed when use kolla_dev_mod

There's a logic error here, we call nova role from nova.yml file
under ansible folder. we should clone code before run
bootstrap_service task. if not, /opt/stack/nova which is empty
will mount to nova_api container.

Change-Id: Icc54c15080db9c2dc92709480e00b990e5a88662

ansible/roles/nova/tasks/bootstrap.yml

@@ -46,6 +46,9 @@
 
 - import_tasks: config_bootstrap.yml
 
+- include_tasks: clone.yml
+  when: nova_dev_mode | bool
+
 - import_tasks: bootstrap_service.yml
 
 - import_tasks: map_cell0.yml

ansible/roles/nova/tasks/deploy.yml

@@ -2,9 +2,6 @@
 - include_tasks: register.yml
   when: inventory_hostname in groups['nova-api']
 
-- include_tasks: clone.yml
-  when: nova_dev_mode | bool
-
 - include_tasks: config.yml
 
 - name: Flush handlers

releasenotes/notes/bug-nova-dev-mod-failed-ad4e64f5a5bc2a6a.yaml

+---
+fixes:
+  - |
+    fix deploy nova failed when use kolla_dev_mod.