add new template folder

The add new templates page now has option to add template folders.
Tweaked wording of other options and h1 to clarify options since it's
not all about templates any more.

Added api client and stuff for it

tests/app/notify_client/test_template_folder_client.py

@@ -0,0 +1,42 @@
+import pytest
+import uuid
+
+from app.notify_client.template_folder_api_client import TemplateFolderAPIClient
+
+
+@pytest.mark.parametrize('parent_id', [uuid.uuid4(), None])
+def test_create_template_folder_calls_correct_api_endpoint(mocker, api_user_active, parent_id):
+    mock_redis_delete = mocker.patch('app.notify_client.RedisClient.delete')
+
+    some_service_id = uuid.uuid4()
+    expected_url = '/service/{}/template-folder'.format(some_service_id)
+    data = {'name': 'foo', 'parent_id': parent_id}
+
+    client = TemplateFolderAPIClient()
+
+    mock_post = mocker.patch('app.notify_client.template_folder_api_client.TemplateFolderAPIClient.post')
+
+    client.create_template_folder(some_service_id, name='foo', parent_id=parent_id)
+
+    mock_post.assert_called_once_with(expected_url, data)
+    mock_redis_delete.assert_called_once_with('service-{}-template-folders'.format(some_service_id))
+
+
+def test_get_template_folders_calls_correct_api_endpoint(mocker, api_user_active):
+    mock_redis_get = mocker.patch('app.notify_client.RedisClient.get', return_value=None)
+    mock_api_get = mocker.patch('app.notify_client.NotifyAdminAPIClient.get', return_value={'data': {'a': 'b'}})
+    mock_redis_set = mocker.patch('app.notify_client.RedisClient.set')
+
+    some_service_id = uuid.uuid4()
+    expected_url = '/service/{}/template-folder'.format(some_service_id)
+    redis_key = 'service-{}-template-folders'.format(some_service_id)
+
+    client = TemplateFolderAPIClient()
+
+    ret = client.get_template_folders(some_service_id)
+
+    assert ret == {'a': 'b'}
+
+    mock_redis_get.assert_called_once_with(redis_key)
+    mock_api_get.assert_called_once_with(expected_url)
+    mock_redis_set.assert_called_once_with(redis_key, '{"a": "b"}', ex=604800)