Begin low-level API for Image v1 and v2

image list for v1 and v2:
* Add --public|--private to command parsers
* Implement local public/private filtering for v1 image_list()
* Pass public/private filter to server for v2 image_list()

Change-Id: Ie7c24ea2d1bf2b3b1b7fa342eb45fee45894634d

openstackclient/api/image_v1.py

@@ -0,0 +1,68 @@
+#   Licensed under the Apache License, Version 2.0 (the "License"); you may
+#   not use this file except in compliance with the License. You may obtain
+#   a copy of the License at
+#
+#        http://www.apache.org/licenses/LICENSE-2.0
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#   WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#   License for the specific language governing permissions and limitations
+#   under the License.
+#
+
+"""Image v1 API Library"""
+
+from openstackclient.api import api
+
+
+class APIv1(api.BaseAPI):
+    """Image v1 API"""
+
+    def __init__(self, endpoint=None, **kwargs):
+        super(APIv1, self).__init__(endpoint=endpoint, **kwargs)
+
+        # Hack this until discovery is up
+        self.endpoint = '/'.join([self.endpoint.rstrip('/'), 'v1'])
+
+    def image_list(
+        self,
+        detailed=False,
+        public=False,
+        private=False,
+        **filter
+    ):
+        """Get available images
+
+        :param detailed:
+            Retrieve detailed response from server if True
+        :param public:
+            Return public images if True
+        :param private:
+            Return private images if True
+
+        If public and private are both True or both False then all images are
+        returned.  Both arguments False is equivalent to no filter and all
+        images are returned.  Both arguments True is a filter that includes
+        both public and private images which is the same set as all images.
+
+        http://docs.openstack.org/api/openstack-image-service/1.1/content/requesting-a-list-of-public-vm-images.html
+        http://docs.openstack.org/api/openstack-image-service/1.1/content/requesting-detailed-metadata-on-public-vm-images.html
+        http://docs.openstack.org/api/openstack-image-service/1.1/content/filtering-images-returned-via-get-images-and-get-imagesdetail.html
+
+        TODO(dtroyer): Implement filtering
+        """
+
+        url = "/images"
+        if detailed or public or private:
+            # Because we can't all use /details
+            url += "/detail"
+
+        image_list = self.list(url, **filter)['images']
+
+        if public != private:
+            # One is True and one is False, so public represents the filter
+            # state in either case
+            image_list = [i for i in image_list if i['is_public'] == public]
+
+        return image_list