Allow OAuth SSL verification to be disabled when importing from GitHub

lib/gitlab/github_import/client.rb

@@ -7,7 +7,7 @@ module Gitlab
         @client = ::OAuth2::Client.new(
           config.app_id,
           config.app_secret,
-          github_options
+          github_options.merge(ssl: { verify: config['verify_ssl'] })
         )
 
         if access_token

spec/lib/gitlab/github_import/client_spec.rb

@@ -26,6 +26,7 @@ describe Gitlab::GithubImport::Client, lib: true do
     end
 
     it 'uses supplied value' do
+      expect(client.client.options[:connection_opts][:ssl]).to eq({ verify: false })
       expect(client.api.connection_options[:ssl]).to eq({ verify: false })
     end
   end