Use migrate for the DB and NullHandler config

syncdb is deprecated since Django 1.7 and removed in 1.9, using the "new"
command.

Configure the logging NullHandler properly

Change-Id: If1365e76cdd0f66b7ef2a90cc52b4692f68a149f

tasks/horizon_db_setup.yml

@@ -14,7 +14,7 @@
 # limitations under the License.
 
 - name: Perform a horizon DB sync
-  command: "{{ horizon_bin }}/horizon-manage.py syncdb --noinput"
+  command: "{{ horizon_bin }}/horizon-manage.py migrate --noinput"
   become: yes
   become_user: "{{ horizon_system_user_name }}"
   changed_when: false

templates/horizon_local_settings.py.j2

@@ -456,7 +456,7 @@ LOGGING = {
     'handlers': {
         'null': {
             'level': 'DEBUG',
-            'class': 'django.utils.log.NullHandler',
+            'class': 'logging.NullHandler',
         },
         'console': {
             # Set the level to "DEBUG" for verbose output logging.