Updated OS version to 6.5, 6.4 is deprecated
Updated CentOS version to 6.5 and image version to 2.5.1 in MOTD
Removed  anaconda-help from yum install
Renamed DVD_LAYOUT location to match 6.5 CentOs version bump
removed eth1 network entry, not needed for kick start
Changed kickstart post logging location to /var/log
Added kernel tuning for vm.dirty_background_bytes (IMAGE-439). Will cause dirty data to begin to be background flushed at 100 Mbytes, so that it writes earlier and more often to avoid the large build up