Updating CentOS 6 servers to CentOS 6.7 CR release

Update --

All of our CentOS 6 servers have been updated to 6.7.

Just a quick note.  We're in the process of upgrading all of our public DNS servers to the CR release of CentOS 6 - this means that they will for all intents and purposes be running the test version of CentOS 6.7.  We're doing this due to an issue in BIND - the DNS server software, which can allow denial of service attacks against BIND.  We will upgrade all the CentOS 6 systems to 6.7 when it is released.