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
3 files changed