Move all gem installation to Gemfile/bundle install

Do not use omnibus-software gem definitions for installing gems,
and use the Gemfile in the inspec project as the source of truth.

Signed-off-by: Lamont Granquist <lamont@scriptkiddie.org>

Gemfile

@@ -1,11 +1,17 @@
 # encoding: utf-8
 source 'https://rubygems.org'
 
-gemspec name: 'inspec'
+gem 'inspec', path: '.'
 
 gem 'ffi', '>= 1.9.14'
 gem 'aws-sdk', '~> 2'
 
+group :omnibus do
+  gem 'rb-readline'
+  gem 'appbundler'
+  gem 'unf_ext', git: 'https://github.com/jquick/ruby-unf_ext.git', ref: 'c0b3bd922214a172976f6f368c0b4e4fbf91ed78'
+end
+
 group :test do
   gem 'minitest', '~> 5.5'
   gem 'rake', '>= 10'
@@ -36,7 +42,6 @@ end
 
 group :tools do
   gem 'pry', '~> 0.10'
-  gem 'rb-readline'
   gem 'license_finder'
   gem 'git', '~> 1.4'
 end

omnibus/config/software/inspec.rb

@@ -1,6 +1,6 @@
 # encoding: utf-8
 #
-# Copyright:: Copyright 2016, Chef Software Inc.
+# Copyright:: Copyright 2016-2019, Chef Software Inc.
 # License:: Apache License, Version 2.0
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -22,10 +22,6 @@ name 'inspec'
 dependency 'ruby'
 dependency 'rubygems'
 dependency 'bundler'
-dependency 'rb-readline'
-dependency 'appbundler'
-dependency 'unf_ext'
-dependency 'train'
 
 license :project_license
 

omnibus/config/software/unf_ext.rb

@@ -1,22 +0,0 @@
-# encoding: utf-8
-# override for unf_ext until
-# https://github.com/knu/ruby-unf_ext/pull/39
-# is merged and released
-
-name 'unf_ext'
-
-dependency 'ruby'
-dependency 'rubygems'
-dependency 'bundler'
-dependency 'appbundler'
-
-license :project_license
-default_version 'c0b3bd922214a172976f6f368c0b4e4fbf91ed78'
-source git: 'https://github.com/jquick/ruby-unf_ext.git'
-
-build do
-  env = with_standard_compiler_flags(with_embedded_path)
-  delete "#{name}-*.gem"
-  gem "build #{name}.gemspec", env: env
-  gem "install #{name}-*.gem --no-document", env: env
-end