I'm hazarding a guess here - that the os/{i386,x86_64}/CentOS/*.rpm's that have 'centos' in the name have had changes made for CentOS. The others have not and the sources are available from upstream at eg
http://mirrors.kernel.org/redhat/redhat/linux/enterprise/5Server/en/os/SRPMS...
Can anyone please confirm/deny that?
Oh well, so much for that idea! According to the release notes (http://wiki.centos.org/Manuals/ReleaseNotes/CentOS5.6) there is a list of packages modified by centos - and that includes httpd. So the absence of 'centos' in the release string does _not_ mean that the package is unmodified (ie it's merely re-built).
Sigh!!! Just have to wait for the centos SRPMS then
for me i do remove the repo's during kickstart however during an upgrade they'll come back unless they are removed from the package.
I have just rebuilt the 5.5 release package to not have them and made the changes to make it appear as the 5.6 release package so for me all good.
thanks