[CI] Utils code dependencies cleanup, add utils to Docker dep install

Author: picandocodigo

Rakefile

@@ -58,7 +58,8 @@ require 'pathname'
 CURRENT_PATH = Pathname(File.expand_path(__dir__))
 SUBPROJECTS = [
   'elasticsearch',
-  'elasticsearch-api'
+  'elasticsearch-api',
+  'elasticsearch-api/utils'
 ].freeze
 
 RELEASE_TOGETHER = [

elasticsearch-api/utils/Gemfile

@@ -17,12 +17,10 @@
 
 source 'https://rubygems.org'
 
-gem 'activesupport'
 gem 'byebug'
 gem 'coderay'
 gem 'json'
 gem 'multi_json'
 gem 'pry'
-gem 'rest-client'
 gem 'rubocop'
 gem 'thor'

elasticsearch-api/utils/thor/generate_source.rb

@@ -19,8 +19,6 @@
 
 require 'thor'
 require 'pathname'
-require 'active_support/core_ext/hash/deep_merge'
-require 'active_support/inflector'
 require 'multi_json'
 require 'coderay'
 require 'pry'