Prevent CredentialsProcess warns from printing in rspec

Author: alextwoods

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

@@ -4,6 +4,10 @@
 
 module Aws
   describe 'Credential Resolution Chain' do
+    before(:each) do
+      allow_any_instance_of(ProcessCredentials).to receive(:warn)
+    end
+
     let(:mock_credential_file) do
       File.expand_path(
         File.join(