Added a CLI command to manage categories

Added two new commands:
* category-list
* category-add

Usage examples:
$ murano-mange category-list
$ murano-manage category-add NAME_OF_THE_NEW_CATEGORY

Change-Id: I98efc6749fa74e74584c5ec8b1741a297cd4660d

muranoapi/cmd/manage.py

@@ -25,6 +25,7 @@ import muranoapi
 from muranoapi.common import consts
 from muranoapi.db.catalog import api as db_catalog_api
 from muranoapi.db import session as db_session
+from muranoapi.openstack.common.db import exception as db_exception
 from muranoapi.openstack.common import log as logging
 from muranoapi.packages import application_package
 
@@ -76,6 +77,27 @@ def do_import_package():
     _do_import_package(CONF.command.directory, CONF.command.categories)
 
 
+def do_list_categories():
+    categories = db_catalog_api.category_get_names()
+
+    if categories:
+        print(">> Murano package categories:")
+        for c in categories:
+            print("* {0}".format(c))
+    else:
+        print("No categories were found")
+
+
+def do_add_category():
+    category_name = CONF.command.category_name
+
+    try:
+        db_catalog_api.category_add(category_name)
+        print(">> Successfully added category {0}".format(category_name))
+    except db_exception.DBDuplicateEntry:
+        print(">> ERROR: Category '{0}' already exists".format(category_name))
+
+
 def add_command_parsers(subparsers):
     parser = subparsers.add_parser('db-sync')
     parser.set_defaults(func=do_db_sync)
@@ -93,6 +115,14 @@ def add_command_parsers(subparsers):
                         help='An optional list of categories this package '
                              'to be assigned to.')
 
+    parser = subparsers.add_parser('category-list')
+    parser.set_defaults(func=do_list_categories)
+
+    parser = subparsers.add_parser('category-add')
+    parser.set_defaults(func=do_add_category)
+    parser.add_argument('category_name',
+                        help='Name of the new category.')
+
 
 command_opt = cfg.SubCommandOpt('command',
                                 title='Commands',

muranoapi/db/catalog/api.py

@@ -30,15 +30,6 @@ SEARCH_MAPPING = {'fqn': 'fully_qualified_name',
 LOG = logging.getLogger(__name__)
 
 
-def category_get_names():
-    session = db_session.get_session()
-    categories = []
-    for row in session.query(models.Category.name).all():
-        for name in row:
-            categories.append(name)
-    return categories
-
-
 def _package_get(package_id, session):
     package = session.query(models.Package).get(package_id)
     if not package:
@@ -387,3 +378,23 @@ def package_delete(package_id):
 def categories_list():
     session = db_session.get_session()
     return session.query(models.Category).all()
+
+
+def category_get_names():
+    session = db_session.get_session()
+    categories = []
+    for row in session.query(models.Category.name).all():
+        for name in row:
+            categories.append(name)
+    return categories
+
+
+def category_add(category_name):
+    session = db_session.get_session()
+    category = models.Category()
+
+    with session.begin():
+        category.update({'name': category_name})
+        category.save(session)
+
+    return category