Make pry a development addon

Gemfile

@@ -25,6 +25,10 @@ gemspec path: File.dirname(__FILE__), name: "chef-dk"
 # EXPERIMENTAL: ALL gems specified here will be installed in chef-dk omnibus.
 # This represents all gems that will be part of chef-dk.
 
+group(:omnibus_package, :development) do
+  gem "pry"
+end
+
 # All software we recognize needs to stay at the latest possible version. But
 # since that's not expressible here, we make it >= the last *known* version to
 # at least prevent downgrades beyond that:
@@ -57,7 +61,6 @@ group(:omnibus_package) do
   gem "knife-spork"
   gem "dep-selector-libgecode"
   gem "nokogiri"
-  gem "pry"
   gem "pry-byebug"
   gem "pry-remote"
   gem "pry-stack_explorer"