samba-ad-dc-1 CI job is slow

[Stefan Metzmacher]

Hi,

> This is a heads-up/warning that something has been affecting the
> samba-ad-dc-1 CI job since several hours ago, causing it to run more
> slowly than usual. All Samba CI pipelines are currently failing due to
> timeouts as a result.
> 
> Just something to be aware of if you're going to be running any pipelines.

I've just recreated our rackspace gitlab-runners and changed
to from '8 GB Standard Instance' to '8 GB General Purpose v1'
VMs.

These use Intel CPUs and hopefully all support aes instructions.

With the legacy '8 GB Standard Instance' we're randomly getting
VMs on AMD processors without aes instructions.
I'm not 100% sure that was the cause for the problems.

At least the first job in using the new runner seems to be fast again,
see https://gitlab.com/samba-team/devel/samba/-/jobs/2193522060

metze