Remove unnecessary wait_for_server_status

In ServerRescueTestJSON's resource_setup, wait_for_server_status
is not needed, instead, create_test_server(wait_until='ACTIVE')
should be used.
This is left over in I9487ddf6db8fda5b5fe6aa3f8787b56b8c865cf5

Change-Id: Ibafa745097fa12f5e6d061640009bc5b935ae52a
diff --git a/tempest/api/compute/servers/test_server_rescue.py b/tempest/api/compute/servers/test_server_rescue.py
index 209ab38..75ba15c 100644
--- a/tempest/api/compute/servers/test_server_rescue.py
+++ b/tempest/api/compute/servers/test_server_rescue.py
@@ -58,10 +58,8 @@
         cls.password = data_utils.rand_password()
         # Server for positive tests
         server = cls.create_test_server(adminPass=cls.password,
-                                        wait_until='BUILD')
+                                        wait_until='ACTIVE')
         cls.server_id = server['id']
-        waiters.wait_for_server_status(cls.servers_client, cls.server_id,
-                                       'ACTIVE')
 
     @classmethod
     def resource_cleanup(cls):