Add oslo.config entry point

This change will allow generating a config sample using the
oslo.config generator.

Generating an os_win config sample may be requested by using:
oslo-config-generator --namespace os_win

Closes-Bug: #1709648

Change-Id: Icc39a472cb05bfd0bcb673959b40b0d2e6e89077

os_win/conf.py

@@ -15,6 +15,8 @@
 
 from oslo_config import cfg
 
+os_win_group = 'os_win'
+
 os_win_opts = [
     cfg.StrOpt('hbaapi_lib_path',
                default='hbaapi.dll',
@@ -30,4 +32,8 @@ os_win_opts = [
 ]
 
 CONF = cfg.CONF
-CONF.register_opts(os_win_opts, 'os_win')
+CONF.register_opts(os_win_opts, os_win_group)
+
+
+def list_opts():
+    return [(os_win_group, os_win_opts)]

setup.cfg

@@ -22,6 +22,10 @@ classifier =
 packages =
     os_win
 
+[entry_points]
+oslo.config.opts =
+    os_win = os_win.conf:list_opts
+
 [build_sphinx]
 source-dir = doc/source
 build-dir = doc/build