Add Ubuntu 16.04 support

[arm4b]

Ubuntu 16.04 packages are currently in unstable quality and available under the staging repos.

TODO: Include & Verify Ubuntu Xenial support within cookbook when StackStorm ships the corresponding packages. The change is probably just about 1 line in kitchen.yml

P.S. It's just a reminder, not to forget about it when we release U16 packages

[shortdudey123]

https://github.com/StackStorm/chef-stackstorm/blob/master/recipes/_packages.rb#L22 can be modified to use the staging repo when the system is ubuntu 16.04+

Or are you more thinking adding it to kitchen testing when a stable version is released?

[arm4b]

Yeah, adding xenial support after shipping StackStorm packages in stable packagecloud repo would be more consistent.

[shortdudey123]

:+1:

[docwhat]

Ubuntu 14.04 has its End of Life coming up in April of 2019 (a couple weeks away)...

It also looks like packages are available for Xenial/16.04 in stable.

[arm4b]

@docwhat Indeed. I think we’ll still support U14 for a while until stopping shipping deb packages after end of Trusty life. If you or someone wants to add Xenial support for this cookbook, - it should be fairly straightforward to add and we’re absolutely open to any additions, as this repo is mainly community-contributed.