acu122453 fix CentOS repo generation
acu127362 - fix motd and resolve conflict
acu118467 - undate node attribute setters to be compatible with chef 11
acu127362 - add comment about linux right_link home dir
Merge pull request #261 from rightscale/ivory_13_15_acu127362_fix_rc1_issues

Ivory 13 15 acu127362 fix rc1 issues