Make the Chef run fail when `npm install` fails.
Manage database.yml/memcached.yml when a host is given.
Simplify detection of "#{deploy[:deploy_to]}/shared/config/".
[zulu-448] Default node.js version set to 0.10.25

cr https://cr.amazon.com/r/2080721/
Drop Ubuntu 11.10 monit template.

Ubuntu 11.10 is not supported anymore.
Fix system sudo user.

Previously /etc/sudoers would always whitelist the 'ubuntu' user, even
on Amazon Linux. Fix this and use the right user name.
Monit template for RedHat 6.

RedHat 6 ships with monit 5.1.1, which does not support some
features. So I disabled
- file exists
- process matches

Kill a child-process (statistics) and the master - in both cases monit
restarted the agent.
Don't install xfsprogs on RedHat 6 / CentOs.

xfsprogs is not available on RedHat 6 (even with EPEL enabled).
Fix userspace Ruby for RHEL 6.4.

Force RHEL 6 to use the Amazon Linux Ruby packages for
User-Space (/usr/local/bin/ruby). This is a short-term hack until
OpsWorks has proper RHEL 6 packages.
Merge remote-tracking branch 'origin/master-chef-11.4' into mainline-chef-11.4