Reorganize Murano-specific Horizon settings

In M release Horizon settings.py file gained a new degree of
granularity with the introduction of local_settings.d directory where
each Horizon plugin could place its own config snippet (which is still
a traditional Django settings.py module). See
https://review.openstack.org/#/c/243974/ for the reference.

Now it's time to reuse this feature.
This patch add the new settings file. The old settings will be remove
in next patch.

Co-Authored-By: zhurong <aaronzhu1121@gmail.com>

DocImpact
Change-Id: Iaab76f2e8e908093248921ce36a0ff2e9df66722
Closes-Bug: #1585552

muranodashboard/local/enabled/_50_murano.py

@@ -0,0 +1,24 @@
+from muranodashboard import exceptions
+
+# The name of the dashboard to be added to HORIZON['dashboards']. Required.
+DASHBOARD = 'murano'
+
+# If set to True, this dashboard will not be added to the settings.
+DISABLED = False
+
+ADD_INSTALLED_APPS = [
+    'muranodashboard',
+]
+
+ADD_EXCEPTIONS = {
+    'recoverable': exceptions.RECOVERABLE,
+    'not_found': exceptions.NOT_FOUND,
+    'unauthorized': exceptions.UNAUTHORIZED,
+}
+
+ADD_JS_FILES = [
+    'muranodashboard/js/upload_form.js',
+    'muranodashboard/js/import_bundle_form.js',
+    'muranodashboard/js/murano.service.js',
+    'muranodashboard/js/more-less.js',
+]

muranodashboard/local/local_settings.d/_50_murano.py

@@ -0,0 +1,27 @@
+# MURANO_API_URL = "http://localhost:8082"
+
+# Set to True to use Glance Artifact Repository to store murano packages
+MURANO_USE_GLARE = False
+
+# Sets the Glance API endpoint to interact with Artifact Repo.
+# If left commented the one from keystone will be used
+# GLANCE_API_URL = 'http://ubuntu1:9292'
+
+MURANO_REPO_URL = 'http://apps.openstack.org/api/v1/murano_repo/liberty/'
+
+# Overrides the default dashboard name (Murano) that is displayed
+# in the main accordion navigation
+# MURANO_DASHBOARD_NAME = "Murano"
+
+# Specify a maximum number of limit packages.
+# PACKAGES_LIMIT = 100
+
+# Set default session backend from browser cookies to database to
+# avoid issues with forms during creating applications.
+DATABASES = {
+    'default': {
+    'ENGINE': 'django.db.backends.sqlite3',
+    'NAME': 'murano-dashboard.sqlite',
+    }
+}
+SESSION_ENGINE = 'django.contrib.sessions.backends.db'

releasenotes/notes/reorganize-dashboard-settings-11733b5c1003154b.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - murano-dashboard now use local_settings.d dir for
+    its own config snippet from Horizon.