sshaccess: Set HostName in SSH config to follow D.R.Y. principles
This is a personal preference, but in my SSH config, I used `HostName`
for the new hostname, since I have a lot of personal scripts and other
shortcuts for Fedora things that go through that host.
So, anything that already uses "bastion.fedoraproject.org" will still
work, and I only have one place I ever have to change my SSH config.
Signed-off-by: Justin W. Flory <git@jwf.io>