Fix message i18n error

Partial-Bug: #1217100

Using tools/check_i18n.py to scan source directory, and fix most of
the errors.

- Message internationalization
- First letter must be capital
- Using comma instead of percent in LOG.xxx

Note: all extension's description are not touched in this patch,
can be fixed after discussing.
Note: all nicira/check_nvp_config.py print messages are not fixed.

Change-Id: I79ef06fd42f6780beb5019c592662536c2a51864

neutron/services/loadbalancer/agent_scheduler.py

@@ -99,7 +99,7 @@ class ChanceScheduler(object):
 
             candidates = plugin.get_lbaas_agents(context, active=True)
             if not candidates:
-                LOG.warn(_('No active lbaas agents for pool %s') % pool['id'])
+                LOG.warn(_('No active lbaas agents for pool %s'), pool['id'])
                 return
 
             chosen_agent = random.choice(candidates)

neutron/services/loadbalancer/drivers/haproxy/agent_manager.py

@@ -178,7 +178,7 @@ class LbaasAgentManager(periodic_task.PeriodicTasks):
                                         self.agent_state)
             self.agent_state.pop('start_flag', None)
         except Exception:
-            LOG.exception("Failed reporting state!")
+            LOG.exception(_("Failed reporting state!"))
 
     def initialize_service_hook(self, started_by):
         self.sync_state()

neutron/services/loadbalancer/drivers/haproxy/namespace_driver.py

@@ -117,7 +117,7 @@ class HaproxyNSDriver(object):
             pool_stats['members'] = self._get_servers_stats(parsed_stats)
             return pool_stats
         else:
-            LOG.warn(_('Stats socket not found for pool %s') % pool_id)
+            LOG.warn(_('Stats socket not found for pool %s'), pool_id)
             return {}
 
     def _get_backend_stats(self, parsed_stats):

neutron/services/loadbalancer/drivers/haproxy/plugin_driver.py

@@ -82,7 +82,7 @@ class LoadBalancerCallbacks(object):
             if not agents:
                 return []
             elif len(agents) > 1:
-                LOG.warning(_('Multiple lbaas agents found on host %s') % host)
+                LOG.warning(_('Multiple lbaas agents found on host %s'), host)
 
             pools = self.plugin.list_pools_on_lbaas_agent(context,
                                                           agents[0].id)

tools/i18n_cfg.py

@@ -94,4 +94,4 @@ msg_format_checkers = [
 
 file_black_list = ["./neutron/tests/unit",
                    "./neutron/openstack",
-                   "./quantum/plugins/bigswitch/tests"]
+                   "./neutron/plugins/bigswitch/tests"]