Add helper method for OpenStack SDK constructor

openstacksdk already has a helper method for dealing with occ, but if a
user is already using the occ helper methods, there is no reason we
should not provide them an easy path to using the SDK.

Change-Id: I1040efb94385fdac0aa02ac960ba95089b954377

README.rst

@@ -355,6 +355,43 @@ with - as well as a consumption argument.
 
   cloud = cloud_config.get_one_cloud(argparse=options)
 
+Constructing OpenStack SDK object
+---------------------------------
+
+If what you want to do is get an OpenStack SDK Connection and you want it to
+do all the normal things related to clouds.yaml, `OS_` environment variables,
+a helper function is provided. The following will get you a fully configured
+`openstacksdk` instance.
+
+.. code-block:: python
+
+  import os_client_config
+
+  sdk = os_client_config.make_sdk()
+
+If you want to do the same thing but on a named cloud.
+
+.. code-block:: python
+
+  import os_client_config
+
+  sdk = os_client_config.make_sdk(cloud='mtvexx')
+
+If you want to do the same thing but also support command line parsing.
+
+.. code-block:: python
+
+  import argparse
+
+  import os_client_config
+
+  sdk = os_client_config.make_sdk(options=argparse.ArgumentParser())
+
+It should be noted that OpenStack SDK has ways to construct itself that allow
+for additional flexibility. If the helper function here does not meet your
+needs, you should see the `from_config` method of
+`openstack.connection.Connection <http://developer.openstack.org/sdks/python/openstacksdk/users/guides/connect_from_config.html>`_
+
 Constructing Legacy Client objects
 ----------------------------------
 

os_client_config/__init__.py

@@ -67,3 +67,16 @@ def make_client(service_key, constructor=None, options=None, **kwargs):
     if not constructor:
         constructor = cloud_config._get_client(service_key)
     return cloud.get_legacy_client(service_key, constructor)
+
+
+def make_sdk(options=None, **kwargs):
+    """Simple wrapper for getting an OpenStack SDK Connection.
+
+    For completeness, provide a mechanism that matches make_client and
+    session_client. The heavy lifting here is done in openstacksdk.
+
+    :rtype: :class:`~openstack.connection.Connection`
+    """
+    from openstack import connection
+    cloud = get_config(options=options, **kwargs)
+    return connection.from_config(cloud_config=cloud, options=options)

releasenotes/notes/sdk-helper-41f8d815cfbcfb00.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - Added helper method for constructing OpenStack SDK
+    Connection objects.