Support specifying `sort_dir` key in packages.search call

Required to implement 'Previous Page' button at App Catalog page
in dashboard.

Change-Id: I9dc110be02e3aaf47c4c876569d01029da48359e
Targets: blueprint normalize-dashboard-pagination

murano/api/v1/__init__.py

@@ -19,7 +19,7 @@ stats = None
 
 SUPPORTED_PARAMS = ('order_by', 'category', 'marker', 'tag', 'class_name',
                     'limit', 'type', 'fqn', 'category', 'owned', 'search',
-                    'include_disabled')
+                    'include_disabled', 'sort_dir')
 LIST_PARAMS = ('category', 'tag', 'class', 'order_by')
 ORDER_VALUES = ('fqn', 'name', 'created')
 PKG_PARAMS_MAP = {'display_name': 'name',

murano/db/catalog/api.py

@@ -317,9 +317,11 @@ def package_search(filters, context, limit=None):
     sort_keys = [SEARCH_MAPPING[sort_key] for sort_key in
                  filters.get('order_by', []) or ['created']]
     marker = filters.get('marker')
+    sort_dir = filters.get('sort_dir')
     if marker is not None:  # set marker to real object instead of its id
         marker = _package_get(marker, session)
-    query = utils.paginate_query(query, pkg, limit, sort_keys, marker)
+    query = utils.paginate_query(
+        query, pkg, limit, sort_keys, marker, sort_dir)
 
     return query.all()