Revert "Add extra stubs for ecs credentials spec"

This reverts commit d233ba2.

Author: mullermp

gems/aws-sdk-core/spec/aws/ecs_credentials_spec.rb

@@ -287,8 +287,6 @@ module Aws
       it 'uses an http IPv6 if it is a loopback' do
         ENV['AWS_CONTAINER_CREDENTIALS_FULL_URI'] = loopback_ipv6.to_s
         stub_request(:get, loopback_ipv6).to_return(status: 200, body: resp)
-        # fails AL2012 somehow
-        stub_request(:get, "http://::1/path").to_return(status: 200, body: resp)
         c = ECSCredentials.new(backoff: 0, retries: 0)
         expect(c.credentials.access_key_id).to eq('akid-full')
         expect(c.credentials.secret_access_key).to eq('secret-full')
@@ -332,8 +330,6 @@ def setup_request(request)
         else
           stub_request(method, uri).with(headers: headers).and_return(**resp)
         end
-        # fails AL2012 somehow
-        stub_request(:get, "http://::1/path")
       end
 
       test_cases.each do |test_case|