Upgrade from RHEL6 beta to RHEL6

RHEL 6 is truly waited for Linux market. Special new kernel and major upgrade on many packages. I upgraded two RHEL6 beta server to RHEL6 from mrepo and spacewalk without running into any trouble.

1. Remove abrt package, it is debug & report application, not needed
2. Make sure /boot with enough space for new kernel
3. Import new RPM-GPG-KEY-redhat-release, can be found on ISO
4. yum update #Almost DONE!
5. reboot #Now we are done!