Load configuration when running chef update

[danielsdeleo]

Similar to chef install, chef update does not have any direct
configurables, but may rely on configuration being loaded in order to
configure SSL to correctly verify connections to a private supermarket.

@chef/workflow

[danielsdeleo]

fixes #518

[tyler-ball]

👍 on the code and test

If I don't specify -c on my chef_update, does the Configurable logic and chef_config call do the automatic lookup? IE, will it now automatically load config from my /etc/chef/client.rb or ~/.chef/knife.rb?

[danielsdeleo]

@tyler-ball yeah, the call to Configurable#chef_config eventually invokes Chef's WorkstationConfigLoader, which is what knife uses to load configuration, so it looks for .chef/config.rb in the CWD and up, then in ~/.chef/config.rb, then does the same except looking for knife.rb (I might be slightly wrong about the order in which it searches for knife.rb vs. config.rb, would have to look at the code).

[tyler-ball]

@danielsdeleo Thanks for the clarification. Because this is a change to existing behavior it seems like this will need a minor version bump, rather than just a patch version bump. Tagged as 0.11.0