Merge pull request #260 from rightscale/ivory_13_15_acu127362_release_candidate_1

Ivory 13 15 acu127362 release candidate 1
acu127362 - bump RL to 5.9.3
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
acu127362 Merge branch 'v5.9'

* v5.9:
  acu127362 - add comment about linux right_link home dir
  acu118467 - undate node attribute setters to be compatible with chef 11
  acu127362 - fix motd and resolve conflict
  acu122453 fix CentOS repo generation
  acu127362 - bump RL to 5.9.3

Conflicts:
	Gemfile.lock
	lib/instance/agent_config.rb
	right_link.gemspec