Removing migrate_db from group_vars/all.

Putting migratedb in group_vars/all overrides any vars
in playbook files and so migrations never get run.

playbooks/group_vars/all

@@ -14,6 +14,3 @@ secure_dir: 'secure_example'
 # this indicates the path to site-specific (with precedence)
 # things like nginx template files
 local_dir:  '../../ansible_local'
-
-# default is not to migrate_db
-migrate_db: false
\ No newline at end of file

playbooks/roles/edxapp/tasks/deploy.yml

@@ -188,7 +188,7 @@
 
 - name: syncdb and migrate
   shell: sudo -u www-data SERVICE_VARIANT=lms /opt/edx/bin/django-admin.py syncdb --migrate --noinput --settings=lms.envs.aws --pythonpath=/opt/wwc/edx-platform
-  when: migrate_db
+  when: migrate_db is defined
   tags:
   - deploy
   - lms