Delete unused methods

spec/shared_examples.rb

@@ -11,10 +11,6 @@ shared_examples_for 'a REST adapter' do
     raise NotImplementedError
   end
 
-  def config_file
-    raise NotImplementedError
-  end
-
   it "returns 404 on non-existing routes" do
     get "/virginmargarita"
     last_response.status.must_equal 404

spec/swift/app_spec.rb

@@ -9,10 +9,6 @@ describe "Swift provider" do
     RemoteStorage::Swift
   end
 
-  def config_file
-    "config.yml.example.swift"
-  end
-
   before do
     stub_request(:put, "#{container_url_for("phil")}/food/aguacate").
       to_return(status: 200, headers: { etag: "0815etag", last_modified: "Fri, 04 Mar 2016 12:20:18 GMT" })