[SHACK-359] Prevent chef-run from executing in the context of ChefDK.

[marcparadise]

chef-run is currently built as part of ChefDK for build dependency reasons, however using it under DK is not supported.

When the chef-run command is run from within the ChefDK install, we will now show an error directing the operator to download Chef Workstation for access to chef-run.

Signed-off-by: Marc A. Paradise marc.paradise@gmail.com

Check List

• [x] New functionality includes tests
• [x] All tests pass
• [x] PR title is a worthy inclusion in the CHANGELOG
• [x] You have locally validated the change