[Tempest] Fix concurrency issue in scenario test

One our scenario tempest test [1] started failing randomly.
It was failing on resources removal. So, start deleting resources
in proper order.

[1] manila_tempest_tests.tests.scenario.test_share_basic_ops.\
        TestShareBasicOpsNFS.test_mount_share_one_vm

Change-Id: Ib1eba66e4d27552cf8e78b302a9f03ac84d978ba
Closes-Bug: #1647350
diff --git a/manila_tempest_tests/tests/scenario/test_share_basic_ops.py b/manila_tempest_tests/tests/scenario/test_share_basic_ops.py
index 0e2e390..304d4e3 100644
--- a/manila_tempest_tests/tests/scenario/test_share_basic_ops.py
+++ b/manila_tempest_tests/tests/scenario/test_share_basic_ops.py
@@ -202,7 +202,6 @@
         for location in locations:
             self.mount_share(location, ssh_client)
             self.umount_share(ssh_client)
-        self.servers_client.delete_server(instance['id'])
 
     @tc.attr(base.TAG_POSITIVE, base.TAG_BACKEND)
     def test_read_write_two_vms(self):