Default enable run_validation

It was default enabled on the gate for a long time.
The option is  required to run api tests stability in case the
guest cooperation required for example volume/interface detach.

https://etherpad.openstack.org/p/handling-of-interface-attach-detach-hotplug-unplug

Related-Prod: PRODX-10450

Change-Id: I9fd433fe249cc80f6799ff240df692a5ce9275a5
diff --git a/releasenotes/notes/tempest-default-run_validations-9640c41b6a4a9121.yaml b/releasenotes/notes/tempest-default-run_validations-9640c41b6a4a9121.yaml
new file mode 100644
index 0000000..8ff0b5c
--- /dev/null
+++ b/releasenotes/notes/tempest-default-run_validations-9640c41b6a4a9121.yaml
@@ -0,0 +1,10 @@
+---
+upgrade:
+  - |
+    ``CONF.validation.run_validation`` default enabled.
+    This option required to be set ``true`` in order to run api tests
+    stability when the guest cooperation required. For example when
+    the guest needs react on Volume/Interface detach.
+    The ssh test makes sure the VM is alive and ready
+    when the detach needs to happen.
+    The option was enabled on the gate for a long time.