Make server action methods[m-z] use **kwargs

As we discussed on
http://lists.openstack.org/pipermail/openstack-dev/2015-July/068864.html
All http POST/PUT methods need to contain **kwargs as their arguments.
This patch makes server action methods[m-z] use **kwargs.

Partially implements blueprint consistent-service-method-names

Change-Id: I7174723f907fd8962d9d12fe76bec2dc06883938
diff --git a/tempest/scenario/test_minimum_basic.py b/tempest/scenario/test_minimum_basic.py
index 25e3e6f..22478b0 100644
--- a/tempest/scenario/test_minimum_basic.py
+++ b/tempest/scenario/test_minimum_basic.py
@@ -84,7 +84,7 @@
         self.assertEqual(volume, got_volume)
 
     def nova_reboot(self, server):
-        self.servers_client.reboot_server(server['id'], 'SOFT')
+        self.servers_client.reboot_server(server['id'], type='SOFT')
         self._wait_for_server_status(server, 'ACTIVE')
 
     def check_partitions(self):
@@ -97,7 +97,7 @@
         self.servers_client.add_security_group(server['id'],
                                                secgroup['name'])
         self.addCleanup(self.servers_client.remove_security_group,
-                        server['id'], secgroup['name'])
+                        server['id'], name=secgroup['name'])
 
         def wait_for_secgroup_add():
             body = (self.servers_client.show_server(server['id'])