Remove redundant addCleanup for servers in server actions tests

for some of tests addCleanup used twice
that leads to errors on cleanup second time
{'code': 404,
'message': 'Instance 0f71fb8d-a3bc-4653-ace3-40fca24178ac could not be found.'}

Related-prod: PRODX-13703
Change-Id: Ie762ae5064fc4648a3ce35287f88783b95df8a86
diff --git a/tempest/api/compute/servers/test_server_actions.py b/tempest/api/compute/servers/test_server_actions.py
index 767ddd9..6f8e297 100644
--- a/tempest/api/compute/servers/test_server_actions.py
+++ b/tempest/api/compute/servers/test_server_actions.py
@@ -284,9 +284,6 @@
                                            'SHUTOFF')
 
         self.client.resize_server(server_id, self.flavor_ref_alt)
-        # NOTE(jlk): Explicitly delete the server to get a new one for later
-        # tests. Avoids resize down race issues.
-        self.addCleanup(self.delete_server, server_id)
         waiters.wait_for_server_status(self.client, server_id,
                                        'VERIFY_RESIZE')
 
@@ -360,9 +357,6 @@
         # values after a resize is reverted
 
         self.client.resize_server(self.server_id, self.flavor_ref_alt)
-        # NOTE(zhufl): Explicitly delete the server to get a new one for later
-        # tests. Avoids resize down race issues.
-        self.addCleanup(self.delete_server, self.server_id)
         waiters.wait_for_server_status(self.client, self.server_id,
                                        'VERIFY_RESIZE')
 
@@ -389,9 +383,6 @@
         self.attach_volume(server, volume)
         # Now resize the server with the blank volume attached.
         self.client.resize_server(self.server_id, self.flavor_ref_alt)
-        # Explicitly delete the server to get a new one for later
-        # tests. Avoids resize down race issues.
-        self.addCleanup(self.delete_server, self.server_id)
         waiters.wait_for_server_status(
             self.client, self.server_id, 'VERIFY_RESIZE')
         # Now revert the resize which should move the instance and it's volume