Remove unneeded "json_pure" Gem (#4677)

* and clean up some 'require' imports

Author: jochenehret

Gemfile

@@ -12,7 +12,6 @@ gem 'googleapis-common-protos', '>= 1.8.0'
 gem 'hashdiff'
 gem 'httpclient'
 gem 'json-diff'
-gem 'json_pure'
 gem 'json-schema'
 gem 'loggregator_emitter', '~> 5.0'
 gem 'membrane', '~> 1.0'

Gemfile.lock

@@ -275,7 +275,6 @@ GEM
     json-schema (6.0.0)
       addressable (~> 2.8)
       bigdecimal (~> 3.1)
-    json_pure (2.8.1)
     jwt (2.10.2)
       base64
     kramdown (2.5.1)
@@ -639,7 +638,6 @@ DEPENDENCIES
   httpclient
   json-diff
   json-schema
-  json_pure
   listen
   loggregator_emitter (~> 5.0)
   machinist (~> 1.0.6)

app/controllers/internal/download_droplets_controller.rb

@@ -1,4 +1,3 @@
-require 'cloudfront-signer'
 require 'cloud_controller/blobstore/client'
 
 module VCAP::CloudController

app/controllers/runtime/stagings_controller.rb

@@ -1,4 +1,3 @@
-require 'cloudfront-signer'
 require 'cloud_controller/blobstore/client'
 require 'presenters/api/staging_job_presenter'
 require 'utils/hash_utils'

spec/unit/lib/cloud_controller/blobstore/storage_cli/azure_storage_cli_client_spec.rb

@@ -1,6 +1,5 @@
 require 'spec_helper'
 require 'tempfile'
-require 'json'
 require_relative '../client_shared'
 require 'cloud_controller/blobstore/storage_cli/azure_storage_cli_client'
 require 'cloud_controller/blobstore/storage_cli/storage_cli_blob'