Flesh out api version defaults

openstackclient needs a bit richer support for api version defaults.
Namely, it knows what defaults it wants to have - but we need to do
defaults processing in os-client-config to get sequencing correct. So
provide an API call to set new defaults that can be used before config
processing. Also, flesh out the dict of known default values with good
defaults to match osc behavior, and add the known v1 default of HP to
the vendors.py values.

Change-Id: I45e2550af58aee616ca168d20a557077beeab007

os_client_config/config.py

@@ -23,6 +23,7 @@ except ImportError:
     ksc_auth = None
 
 from os_client_config import cloud_config
+from os_client_config import defaults
 from os_client_config import exceptions
 from os_client_config import vendors
 
@@ -41,18 +42,23 @@ VENDOR_FILES = [
     os.path.join(d, 'clouds-public.yaml') for d in VENDOR_SEARCH_PATH]
 
 
+def set_default(key, value):
+    defaults._defaults[key] = value
+
+
 def get_boolean(value):
     if value.lower() == 'true':
         return True
     return False
 
 
-def _get_os_environ(defaults):
+def _get_os_environ():
+    ret = dict(defaults._defaults)
     for (k, v) in os.environ.items():
         if k.startswith('OS_'):
             newkey = k[3:].lower()
-            defaults[newkey] = v
-    return defaults
+            ret[newkey] = v
+    return ret
 
 
 def _auth_update(old_dict, new_dict):
@@ -74,11 +80,7 @@ class OpenStackConfig(object):
         self._config_files = config_files or CONFIG_FILES
         self._vendor_files = vendor_files or VENDOR_FILES
 
-        defaults = dict(
-            auth_type='password',
-            compute_api_version='1.1',
-        )
-        self.defaults = _get_os_environ(defaults)
+        self.defaults = _get_os_environ()
 
         # use a config file if it exists where expected
         self.cloud_config = self._load_config_file()

os_client_config/defaults.py

@@ -0,0 +1,23 @@
+# Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
+#
+# 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.
+
+_defaults = dict(
+    auth_type='password',
+    compute_api_version='2',
+    identity_api_version='2',
+    image_api_version='1',
+    network_api_version='2',
+    object_api_version='1',
+    volume_api_version='1',
+)

os_client_config/vendors.py

@@ -20,6 +20,7 @@ CLOUD_DEFAULTS = dict(
         ),
         region_name='region-b.geo-1',
         dns_service_type='hpext:dns',
+        image_api_version='1',
     ),
     rackspace=dict(
         auth=dict(