Expose keystoneclient's session and auth plugin loading parameters

In change id (I7b3b825737dde333c8d88019d814304cbefdbfc7) support
was added to be able to specify and use the standard session and
auth plugin helpers from keystoneclient to standardize the
options available for talking to neutron.

However, these config options do not show up when we generate
the sample configuration file. Jamie Lennox has details in his
blog as well:
http://www.jamielennox.net/blog/2015/02/17/loading-authentication-plugins/

Since there are many auth plugins, we generate config params for
a few common ones.

DocImpact

Closes-Bug: #1486590
Change-Id: Id6b3ff845c2388fa01b1d3b28093f5bdf27136ff

etc/nova/nova-config-generator.conf

@@ -6,6 +6,7 @@ namespace = nova.api
 namespace = nova.cells
 namespace = nova.compute
 namespace = nova.network
+namespace = nova.network.neutronv2
 namespace = nova.scheduler
 namespace = nova.virt
 namespace = nova.openstack.common.memorycache

nova/network/neutronv2/api.py

@@ -15,6 +15,7 @@
 #    under the License.
 #
 
+import copy
 import time
 import uuid
 
@@ -135,8 +136,8 @@ deprecations = {'cafile': [cfg.DeprecatedOpt('ca_certificates_file',
                 'timeout': [cfg.DeprecatedOpt('url_timeout',
                                               group=NEUTRON_GROUP)]}
 
-session.Session.register_conf_options(CONF, NEUTRON_GROUP,
-                                      deprecated_opts=deprecations)
+_neutron_options = session.Session.register_conf_options(
+    CONF, NEUTRON_GROUP, deprecated_opts=deprecations)
 auth.register_conf_options(CONF, NEUTRON_GROUP)
 
 
@@ -151,6 +152,25 @@ _SESSION = None
 _ADMIN_AUTH = None
 
 
+def list_opts():
+    list = copy.deepcopy(_neutron_options)
+    list.insert(0, auth.get_common_conf_options()[0])
+    # NOTE(dims): There are a lot of auth plugins, we just generate
+    # the config options for a few common ones
+    plugins = ['password', 'v2password', 'v3password']
+    for name in plugins:
+        for plugin_option in auth.get_plugin_class(name).get_options():
+            found = False
+            for option in list:
+                if option.name == plugin_option.name:
+                    found = True
+                    break
+            if not found:
+                list.append(plugin_option)
+    list.sort(key=lambda x: x.name)
+    return [(NEUTRON_GROUP, list)]
+
+
 def reset_state():
     global _ADMIN_AUTH
     global _SESSION

setup.cfg

@@ -32,6 +32,7 @@ oslo.config.opts =
     nova.cells = nova.cells.opts:list_opts
     nova.compute = nova.compute.opts:list_opts
     nova.network = nova.network.opts:list_opts
+    nova.network.neutronv2 = nova.network.neutronv2.api:list_opts
     nova.scheduler = nova.scheduler.opts:list_opts
     nova.virt = nova.virt.opts:list_opts
     nova.openstack.common.memorycache = nova.openstack.common.memorycache:list_opts