Move ServerStableDeviceRescueTest to wait for SSH-able server

ServerStableDeviceRescueTest also perform the attach_volume
on rescue server and in cleanup detach_volume. As described in
the bug#1960346 we need to wait for server readiness before
detach volume called.

Also making centos stream 9 job as voting.

Closes-Bug: #1960346
Change-Id: Ia213297b13f42d39213dea9a3b2cfee561cdcf28
diff --git a/zuul.d/tempest-specific.yaml b/zuul.d/tempest-specific.yaml
index 7d28e5c..a4a4b67 100644
--- a/zuul.d/tempest-specific.yaml
+++ b/zuul.d/tempest-specific.yaml
@@ -85,7 +85,7 @@
 - job:
     name: tempest-full-centos-9-stream
     parent: tempest-full-py3-centos-8-stream
-    voting: false
+    voting: true
     nodeset: devstack-single-node-centos-9-stream
 
 - job: