[CentOS-announce] New upstream URLs for CentOS update announcements

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We are changing the URLs for new CentOS updates from the current link
types (example):

https://rhn.redhat.com/errata/RHSA-2017-1679.html

to these type of links instead (example):

https://access.redhat.com/errata/RHSA-2017:1679

The reason for the change is that RHN Hosted will reach its service end
of lifetime on July 31, 2017 (see the rhn.redhat.com link above for
details).

We are sorry for any inconvenience this may cause.

Discussions on the main CentOS mailing list in this thread, if required:

https://lists.centos.org/pipermail/centos/2017-July/165300.html

Thanks,
Johnny Hughes