[dd-handler] Bump requirement on chef_handler

[olivielpeau]

Allows removing the require on our handler, since chef_handler >= 1.2
can take care of requiring our handler. Should fix #338

Keep installing the chef_gem and enabling the handler at compile time
so that the handler can report compilation errors.

Unfortunately we still need to skip the dd-handler recipe in why_run mode with chef_handler 1.4 (see inline comment for link to related issue)

[degemer]

It would be nice to enable the handler on Circle CI (only place where an error there could actually be detected, as far as I know).
As you said, you could lower the chef_handler requirement to 1.2 if it still works (even though Chef 11 users will have to bump it to at least 1.3).
👍

[olivielpeau]

Let's wait a bit before merging this, I want to have a quick look at how the requirement bump would play with "the rest of the world" of community cookbooks

[olivielpeau]

Chef 13 seems to require chef_handler 2.x (see #406), would also affect this PR.

[bai]

👋 It's almost April and Chef 13 is less than a month away. Are there any blockers on this one — anything I could help with?

[degemer]

Hello @bai, #414 loosened the requirements on chef_handler which we thought was required for Chef 13. It might actually not be the case (see this comment on the related chef_handler issue).

I tested chef 13.0.64 with both chef_handler 1.4.0 & 2.1.0, and it worked in both cases, so I think we're ready. Please let us know if you encounter an issue with it!

If you wanted to use chef_handler 2.x, we'll release 2.9.0 this week that will allow you to do that.